int (1+tan^2 x)/(1-tan^2 x) dx equals...

`int (1+tan^2 x)/(1-tan^2 x) dx `equals

A

`log((1-tanx)/(1+tanx))+C`

B

`log((1+tanx)/(1-tanx))+C`

C

`1/2log((1-tanx)/(1+tanx))+C`

D

`1/2 log((1+tanx)/(1-tanx))+C`

Text Solution

Verified by Experts

The correct Answer is:

D

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