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Prove that : 2 tan^-1 (1/2) + tan^-1 (1/...

Prove that : `2 tan^-1 (1/2) + tan^-1 (1/5) =tan^-1 (23/11)`

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

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