A geometry problem by Rishabh Jain

Geometry Level 3

\(\arctan { \frac { 1 }{ 3 } } +\arctan { \frac { 1 }{ 7 } + } \arctan { \frac { 1 }{ 13 } +\arctan { \frac { 1 }{ 21 } + } } ........upto\quad \infty \) find the above sum .

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