can you find the trick for this infinite sum??
10:27
can you find the limit of this recursive sequence??
16:04
I solved this two ways -- which do you prefer??
9:08
how to setup partial fractions (all cases)
9:02
sqrt(i)
20:35
Amadores acabaram de resolver um problema de matemática de 30 anos
26:43
can you do the hardest problem from the European Mathematical Cup??
8:06
INCREDIBLE Checkmate After Only 21 Moves!!!!!!
12:45