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P.T Tan^-1""1/7+Tan^-1""1/13-Tan^-1""2/...

P.T `Tan^-1""1/7+Tan^-1""1/13-Tan^-1""2/9=0`

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The correct Answer is:
show that `Tan^(-1)1/7+Tan^(-1)1/13= Tan^(-1) 2/9`.
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