# Not easy as sum of squares

Calculus Level 2

$\large \sum _{ k=1 }^{ \infty }{ \frac { 1 }{ k^{ 2 } } }$

If the series above equals to $$\frac{\pi^a}b$$ for positive integers $$a$$ and $$b$$, find the value of $$a+b$$.

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