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xpaul

Apparently, this user prefers to keep an air of mystery about them.

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43 limit $\lim_{n\to ∞}\sin(\pi(2+\sqrt3)^n)$ Aug 23 '16
33 Closed form for $\sum_{n=-\infty}^{\infty}\frac{1}{(n-a)^2+b^2}$. May 9 '13
33 Evaluating the integral $\int_0^\infty \frac{\sin x} x \,\mathrm dx = \frac \pi 2$? Mar 12 '13
32 Infinite sum of reciprocals of pentagonal numbers May 30 '15
23 Funny identities Apr 11 '13
22 Nice proofs of $\zeta(4) = \frac{\pi^4}{90}$? Apr 21 '13
20 Closed form of $\int_{0}^{\infty} \frac{\tanh(x)\,\tanh(2x)}{x^2}\;dx$ Nov 11 '14
19 Evaluating $\int_0^{\infty}\frac{\ln(x^2+1)}{x^2+1}dx$ Apr 12 '13
17 Prove $\lim_{x \rightarrow 0} \frac {\sin(x)}{x} = 1$ with the epsilon-delta definition of limit. Mar 13 '13
17 Math Olympiad Algebra Question Jun 5 '14
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