Any way to simplify $int sqrt{f'(x)} mathrm{d} x$?
$begingroup$
Trying to calculate the length of some geodesic I came across an expression of the form
$$
int sqrt{f'(x)} ,mathrm{d}x
$$
which got me wondering if there is any way to simplify or calculate such integrals in general (where $f: mathbb{R} to mathbb{R}$ is sufficiently regular).
EDIT: I'm looking for a simplification in terms on $f$. (Anti-)derivatives of $f$ and integral transforms of $f$ would be interesting too.
EDIT 2: The asymptotic expansion for the integral of a product
$$ int f g = sum_{k=0}^{infty} (-1)^k f^{(k)} g^{(-1-k)} $$
@AmbretteOrrisey has given in the comments actually looks quite interesting (even if it is not very useful). I guess something similar for my expression would be nice, too.
calculus integration soft-question
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
$endgroup$
|
show 2 more comments
$begingroup$
Trying to calculate the length of some geodesic I came across an expression of the form
$$
int sqrt{f'(x)} ,mathrm{d}x
$$
which got me wondering if there is any way to simplify or calculate such integrals in general (where $f: mathbb{R} to mathbb{R}$ is sufficiently regular).
EDIT: I'm looking for a simplification in terms on $f$. (Anti-)derivatives of $f$ and integral transforms of $f$ would be interesting too.
EDIT 2: The asymptotic expansion for the integral of a product
$$ int f g = sum_{k=0}^{infty} (-1)^k f^{(k)} g^{(-1-k)} $$
@AmbretteOrrisey has given in the comments actually looks quite interesting (even if it is not very useful). I guess something similar for my expression would be nice, too.
calculus integration soft-question
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
$endgroup$
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
1
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
1
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17
|
show 2 more comments
$begingroup$
Trying to calculate the length of some geodesic I came across an expression of the form
$$
int sqrt{f'(x)} ,mathrm{d}x
$$
which got me wondering if there is any way to simplify or calculate such integrals in general (where $f: mathbb{R} to mathbb{R}$ is sufficiently regular).
EDIT: I'm looking for a simplification in terms on $f$. (Anti-)derivatives of $f$ and integral transforms of $f$ would be interesting too.
EDIT 2: The asymptotic expansion for the integral of a product
$$ int f g = sum_{k=0}^{infty} (-1)^k f^{(k)} g^{(-1-k)} $$
@AmbretteOrrisey has given in the comments actually looks quite interesting (even if it is not very useful). I guess something similar for my expression would be nice, too.
calculus integration soft-question
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
$endgroup$
Trying to calculate the length of some geodesic I came across an expression of the form
$$
int sqrt{f'(x)} ,mathrm{d}x
$$
which got me wondering if there is any way to simplify or calculate such integrals in general (where $f: mathbb{R} to mathbb{R}$ is sufficiently regular).
EDIT: I'm looking for a simplification in terms on $f$. (Anti-)derivatives of $f$ and integral transforms of $f$ would be interesting too.
EDIT 2: The asymptotic expansion for the integral of a product
$$ int f g = sum_{k=0}^{infty} (-1)^k f^{(k)} g^{(-1-k)} $$
@AmbretteOrrisey has given in the comments actually looks quite interesting (even if it is not very useful). I guess something similar for my expression would be nice, too.
calculus integration soft-question
calculus integration soft-question
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
edited Jan 18 at 18:12
0x539
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
asked Dec 13 '18 at 23:33
0x5390x539
1,445518
1,445518
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
1
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
1
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17
|
show 2 more comments
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
1
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
1
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
1
1
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
1
1
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17
|
show 2 more comments
1 Answer
1
active
oldest
votes
$begingroup$
I think you're looking for some sort of analog to $$frac {mathrm d(sqrt {f'(x)})} {mathrm dx} = frac {f''(x)} {2 sqrt{f'(x)}} $$
But for $int sqrt{f'(x)} mathrm dx$. As alluded to in the comment, you will probably be disappointed to know that there is no such connection. Unfortunately integrals rarely work out this nicely.
Indeed, $int sqrt{f(x)} mathrm dx$ may be completely different from $int f(x) mathrm dx$. For example:
$$int (1 - x^3) mathrm dx$$
is elementary and a polynomial itself, but:
$$int sqrt{1 - x^3} mathrm dx$$
can only be resolved in terms of the elliptic integrals. (but has nice definite integrals over eg. $[0,1]$ with the aid of the $Gamma$ function)
It ultimately boils down to the properties of $f'$. Certain $f'$s will resolve nicely, for example squares of functions with known antiderivatives, or in general even powers of nice functions, (eg. $sqrt{f'(x)} = text{polynomial} cdot sin x$ which will fall out, eventually, by parts) others will have unwieldly elementary antiderivatives, (eg. reciprocals of very high-order polynomials, which will eventually decompose into partial fractions and admit elementary anti-derivatives) or none at all (eg. $frac {sin x} x$).
Predicting whether a function has an elementary antiderivative is a question in differential algebra and is not an easy question at all. I don't have the background to understand it, but there is an answer here that addresses the topic.
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "69"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3038740%2fany-way-to-simplify-int-sqrtfx-mathrmd-x%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
I think you're looking for some sort of analog to $$frac {mathrm d(sqrt {f'(x)})} {mathrm dx} = frac {f''(x)} {2 sqrt{f'(x)}} $$
But for $int sqrt{f'(x)} mathrm dx$. As alluded to in the comment, you will probably be disappointed to know that there is no such connection. Unfortunately integrals rarely work out this nicely.
Indeed, $int sqrt{f(x)} mathrm dx$ may be completely different from $int f(x) mathrm dx$. For example:
$$int (1 - x^3) mathrm dx$$
is elementary and a polynomial itself, but:
$$int sqrt{1 - x^3} mathrm dx$$
can only be resolved in terms of the elliptic integrals. (but has nice definite integrals over eg. $[0,1]$ with the aid of the $Gamma$ function)
It ultimately boils down to the properties of $f'$. Certain $f'$s will resolve nicely, for example squares of functions with known antiderivatives, or in general even powers of nice functions, (eg. $sqrt{f'(x)} = text{polynomial} cdot sin x$ which will fall out, eventually, by parts) others will have unwieldly elementary antiderivatives, (eg. reciprocals of very high-order polynomials, which will eventually decompose into partial fractions and admit elementary anti-derivatives) or none at all (eg. $frac {sin x} x$).
Predicting whether a function has an elementary antiderivative is a question in differential algebra and is not an easy question at all. I don't have the background to understand it, but there is an answer here that addresses the topic.
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
$endgroup$
add a comment |
$begingroup$
I think you're looking for some sort of analog to $$frac {mathrm d(sqrt {f'(x)})} {mathrm dx} = frac {f''(x)} {2 sqrt{f'(x)}} $$
But for $int sqrt{f'(x)} mathrm dx$. As alluded to in the comment, you will probably be disappointed to know that there is no such connection. Unfortunately integrals rarely work out this nicely.
Indeed, $int sqrt{f(x)} mathrm dx$ may be completely different from $int f(x) mathrm dx$. For example:
$$int (1 - x^3) mathrm dx$$
is elementary and a polynomial itself, but:
$$int sqrt{1 - x^3} mathrm dx$$
can only be resolved in terms of the elliptic integrals. (but has nice definite integrals over eg. $[0,1]$ with the aid of the $Gamma$ function)
It ultimately boils down to the properties of $f'$. Certain $f'$s will resolve nicely, for example squares of functions with known antiderivatives, or in general even powers of nice functions, (eg. $sqrt{f'(x)} = text{polynomial} cdot sin x$ which will fall out, eventually, by parts) others will have unwieldly elementary antiderivatives, (eg. reciprocals of very high-order polynomials, which will eventually decompose into partial fractions and admit elementary anti-derivatives) or none at all (eg. $frac {sin x} x$).
Predicting whether a function has an elementary antiderivative is a question in differential algebra and is not an easy question at all. I don't have the background to understand it, but there is an answer here that addresses the topic.
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
$endgroup$
add a comment |
$begingroup$
I think you're looking for some sort of analog to $$frac {mathrm d(sqrt {f'(x)})} {mathrm dx} = frac {f''(x)} {2 sqrt{f'(x)}} $$
But for $int sqrt{f'(x)} mathrm dx$. As alluded to in the comment, you will probably be disappointed to know that there is no such connection. Unfortunately integrals rarely work out this nicely.
Indeed, $int sqrt{f(x)} mathrm dx$ may be completely different from $int f(x) mathrm dx$. For example:
$$int (1 - x^3) mathrm dx$$
is elementary and a polynomial itself, but:
$$int sqrt{1 - x^3} mathrm dx$$
can only be resolved in terms of the elliptic integrals. (but has nice definite integrals over eg. $[0,1]$ with the aid of the $Gamma$ function)
It ultimately boils down to the properties of $f'$. Certain $f'$s will resolve nicely, for example squares of functions with known antiderivatives, or in general even powers of nice functions, (eg. $sqrt{f'(x)} = text{polynomial} cdot sin x$ which will fall out, eventually, by parts) others will have unwieldly elementary antiderivatives, (eg. reciprocals of very high-order polynomials, which will eventually decompose into partial fractions and admit elementary anti-derivatives) or none at all (eg. $frac {sin x} x$).
Predicting whether a function has an elementary antiderivative is a question in differential algebra and is not an easy question at all. I don't have the background to understand it, but there is an answer here that addresses the topic.
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
$endgroup$
I think you're looking for some sort of analog to $$frac {mathrm d(sqrt {f'(x)})} {mathrm dx} = frac {f''(x)} {2 sqrt{f'(x)}} $$
But for $int sqrt{f'(x)} mathrm dx$. As alluded to in the comment, you will probably be disappointed to know that there is no such connection. Unfortunately integrals rarely work out this nicely.
Indeed, $int sqrt{f(x)} mathrm dx$ may be completely different from $int f(x) mathrm dx$. For example:
$$int (1 - x^3) mathrm dx$$
is elementary and a polynomial itself, but:
$$int sqrt{1 - x^3} mathrm dx$$
can only be resolved in terms of the elliptic integrals. (but has nice definite integrals over eg. $[0,1]$ with the aid of the $Gamma$ function)
It ultimately boils down to the properties of $f'$. Certain $f'$s will resolve nicely, for example squares of functions with known antiderivatives, or in general even powers of nice functions, (eg. $sqrt{f'(x)} = text{polynomial} cdot sin x$ which will fall out, eventually, by parts) others will have unwieldly elementary antiderivatives, (eg. reciprocals of very high-order polynomials, which will eventually decompose into partial fractions and admit elementary anti-derivatives) or none at all (eg. $frac {sin x} x$).
Predicting whether a function has an elementary antiderivative is a question in differential algebra and is not an easy question at all. I don't have the background to understand it, but there is an answer here that addresses the topic.
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
answered Dec 14 '18 at 12:59
George CooteGeorge Coote
865311
865311
add a comment |
add a comment |
Thanks for contributing an answer to Mathematics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3038740%2fany-way-to-simplify-int-sqrtfx-mathrmd-x%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
$begingroup$
Please make the question more specific. Otherwise I can just say $intsqrt{f'(x)}dx$ and be done with it. Are you specifying that the answer can only be in terms of $f(x)$, $f'(x)$ and $int f(x)dx$? What about $f(x^2)$ or $f''(x)$? Do you allow those?
$endgroup$
– YiFan
Dec 14 '18 at 0:00
$begingroup$
@YiFan As I wrote in my edit, those are all fine. Basically you know all values of $f$ as well as of its derivatives and integrals.
$endgroup$
– 0x539
Dec 14 '18 at 0:02
$begingroup$
So the simplification is $intsqrt{f'(x)}dx$. Done! Unless this expression is not actually allowed, in which case you must specify.
$endgroup$
– YiFan
Dec 14 '18 at 0:04
1
$begingroup$
No, there is in general no simple form for this. It is a frustration of calculus teachers that there is only a short list of examples where the arc length of $y=f(x)$ can be computed explicitly. Which is why all the calculus books have the same exercises for this.
$endgroup$
– GEdgar
Dec 14 '18 at 1:14
1
$begingroup$
Not likely - you generally don't get 'pleasant' theorems for integration of functions of general functions in the way you do for differentiation. There might conceivably be some kind of infinite series that produces a tractable asymptotic expansion in certain cases - as there is for the product of two functions - $sum_{k=0}^infty(-1)^koperatorname{f^{(k)}}operatorname{g^{(-1-k)}}$ ... but the way these integrals are generally done is on an ad hoc basis - broaching the properties of whatever particular function is the argument of the square-root function.
$endgroup$
– AmbretteOrrisey
Dec 14 '18 at 14:17