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Prove that 2 tan^-1(1/2) + tan^-1 (1/7) ...

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

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SHARAM PUBLICATION-MODEL QUESTION PAPER 20-EXERCISE
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  3. Prove that 2 tan^-1(1/2) + tan^-1 (1/7) = tan^-1 (31/17).

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