15:07

Find P(x)

18:35

The Basel Problem

21:24

A long road to the limit

16:49

Find all positive integer n

8:47

A Functional Equation from Samara Math Olympiads

9:42

(n-1)!+1 = n^2

27:12

Austrian Olympiad System of Equations

17:08

Solving a Quartic Equation