1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question about functions

  1. Sep 29, 2013 #1

    I am curious, suppose I have a function of x, f(x). Suppose I also have another function P(x). Does this mean I am allowed to have f(P) and I can do standard methods of integration and such on it?
  2. jcsd
  3. Sep 29, 2013 #2
    If P is the variable that you are integrating. For example, [itex]\int \sin(x^2) d(x^2)[/itex] can be computed the way it seems you want to compute it. That is, [itex]\int \sin(x^2) d(x^2) = - \cos(x^2) [/itex]. However, [itex]\int \sin(x^2) dx \neq - \cos(x^2)[/itex]. The question you are asking has a lot to do with the integration method known as "u-substitution." Do you know what that is?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Question functions Date
B Beginner function question Feb 17, 2018
I Question about the Divisor Function/Sums and Project Euler Feb 16, 2018
I Question about Digamma function and infinite sums Sep 23, 2016
I Notation question Sep 20, 2016
I Prime-counting function questions Aug 2, 2016