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2 tan^1 (1/2)=...

`2 tan^1 (1/2)`=

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Prove that : 2tan^-1 (1/2) + tan^-1 (1/6) = tan^-1 (27/14)

Prove that : 2tan^-1 (1/2) + tan^-1 (1/7) = tan^-1 (31/17)

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