A superb limit problem: lim {x \to 0} (x!)^(1/x)
32:12
Solving the hardest integral on math stack exchange (cleo's monster integral)
20:07
This integral is RIDICULOUS
16:57
A very interesting log trig integral
14:56
A fascinating integral solved using Feynman's technique: int (0,infty) ln(x)/(1+cosh(x))
46:23
How to Extend the Sum of Any* Function
27:40
The Biggest Misconception In Physics
18:35
The Basel Problem
14:48