I used a double integral to solve a single improper integral
22:27
a spectacular solution to the Basel problem (sum of 1/n^2 via a complex integral)
12:59
if x+y=8, find the max of x^y (Lambert W function)
11:28
3 levels of "perpendicular"
11:54
My all-in-one calculus problem
7:16
Sum from 1 to infinity of 1/(k^2+1)
9:51
this integral only looks simple
17:53
Supreme Integral with Feynman's Trick
9:50