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 Mar23 revised how to show the following seriers is not convergent deleted 11 characters in body Mar23 revised Trigonometry Simplification added 8 characters in body Mar23 revised Trigonometry Simplification added 2 characters in body Feb28 awarded limits Feb27 awarded Popular Question Feb27 awarded Nice Answer Jan24 awarded Notable Question Dec30 revised Show that all derivatives of $f(x) = \frac{\sin(2\pi x)}{\pi x}$ belong to $L^2(\mathbb{R})$ added 3 characters in body; edited title Dec19 awarded Constituent Dec14 comment I have a question about integrating, and what to do about the constant. $\displaystyle\int\frac{1}{1-z}dz$ If you know the initial value of the function, then the value of the constant can be determined. In this case, the value of the function at $x=0$ is zero. Because we know that sum of zeros is zero. Dec12 comment Show that $\int_0^a f(x)dx=\int_0^a f(a-x)dx$ let $y=a-x$ then usual substitution Dec12 revised Find $\lim_{x \to 0}\frac{2^x-1}x$ added 1 character in body Dec12 comment Laurent Series of $f(z)=(z+1)\sin\frac{z^{2}+2z+5}{(z+1)^{2}}$ @user101998 how about using formula $\sin(a+b)$ ?? Dec11 answered What is a limit? Dec11 comment Evaluating Limit of Integral (Real Analysis) here is something you might find helpful Dec9 awarded Caucus Dec7 comment Proof of a Gaussian Integral property try completing square on the exponent. Dec4 comment When does $\ln(x)=\sin(x)$? looks like there is no nice expression for the answer. You can use numerical approach the find the approximate value. Dec4 revised When does $\ln(x)=\sin(x)$? edited title Dec3 answered Explain why $|x^2-x|$ is not differentiable at $x=1$