Sunday, March 25, 2018

calculus - Can one solve intinfty0fracsin(x)xdx *from its Taylor series antiderivative directly*?

This question was inspired by this question:



Evaluating the integral 0sinxx dx=π2?





Well, can anyone prove this without using Residue theory. I actually thought of doing this:
0sinxxdx=lim
but I don't see how \pi comes here, since we need the answer to be equal to \frac{\pi}{2}.




Answers were given to the stated question -- how to prove without using Residue theory. Yet the quote suggests an obvious follow-up question: can you prove the integral from the Taylor series expansion directly, somehow?

No comments:

Post a Comment

analysis - Injection, making bijection

I have injection f \colon A \rightarrow B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...