For Nihar and Kartik

Geometry Level 3

\[ \displaystyle \tan \left [ \sum_{n=1}^{\infty} \arctan \left ( \dfrac{1}{2n^{2}} \right ) \right ] = \ ? \]


Nihar, take this one as a warm up question (since this one's too easy), later on we'll have a rematch .
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