Interesting probability question from the AMC
11:18
AIME, the smart way and the stupid way
17:43
Matrix Proof: det(exp A) = exp(Tr A)
11:03
The Derivative Equals The Square
13:36
My favorite proof of the n choose k formula!
9:48
Proof: Orthogonal Matrices Satisfy A^TA=I
10:23
Why can we change lim n→∞ to lim x→∞?
15:16
Why can't we group the terms in 1-1+1-1+... ?
25:21