One of my favorite identities.
21:46
The dilogarithm -- a favorite "special function"
18:17
I really like this integral
21:25
one of the most beautiful techniques
14:59
my all-in-one calculus question
22:27
Bernoulli Numbers, Cotangent, and Tangent
15:11
reciprocals of twin primes
26:07
Deriving Euler's formula four ways!
19:06