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

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

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Prove that: tan^(-1) ""(1)/(7) + tan^(-1) ""(1)/(13) - tan^(-1) ""(2)/(9) =0