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Prove that : cos^(-1).(4)/(5)+ tan ^(-1)...

Prove that : `cos^(-1).(4)/(5)+ tan ^(-1).(3)/(5) = tan^(-1) .(27)/(11)`
(ii) Prove that :` sin^(-1).(3)/(5)+ tan ^(-1).(3)/(5) = tan^(-1) .(27)/(11)`

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