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

Prove that
`2 tan^(-1) . 1/7 +tan^(-1) . 1/3 = tan^(-1) . 9/13`

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Knowledge Check

tan^(-1)""1/7+2tan^(-1)"" 1/3=

A

`-pi//4`

B

`pi//4`

C

`pi//2`

D

`-pi//2`

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MODERN PUBLICATION-INVERSE - TRIGONOMETRIC FUNCTIONS-EXERCISE 2 (b) (Short Answer Type Questions)

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