This works for me: http://www.wolframalpha.com/input/?i=%28sum+1%2F+%28n+*+pi%29+^2+from+n+%3D+1+to+inf http://www.wolframalpha.com/input/?i=%28sum+1%2F+%28n+*+

This works for me: http://www.wolframalpha.com/input/?i=%28sum+1%2F+%28n+*+pi%29+^2+from+n+%3D+1+to+inf http://www.wolframalpha.com/input/?i=%28sum+1%2F+%28n+*+pi%2...