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Prove that : 2 tan^-1 (1/5) + tan^-1 (1/...

Prove that : `2 tan^-1 (1/5) + tan^-1 (1/8) = tan^-1(4/7)`

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Prove that : 2 tan^-1(1/5) + tan^-1(1/6) = tan^-1(42/67)

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