Here [1] is a page with lots of neat proofs of the solution of the Basel problem. [1]: http://math.stackexchange.com/questions/8337/different-methods-to-comput

Here [1] is a page with lots of neat proofs of the solution of the Basel problem. [1]: http://math.stackexchange.com/questions/8337/different-methods-to-compute-sum-limits-n-1-infty-frac1n2 http://math.stackexchange.com/questions/8337/different-metho...