- #1

nil1996

- 301

- 7

## Homework Statement

[itex]\sqrt{\frac{1-cos2x}{1+cos2x}}[/itex]

differentiate with respect to x

## Homework Equations

none

## The Attempt at a Solution

i have simplified it by substituting cos2x as 1-2sin

^{2}x and 2cos

^{2}x-1

I have got the answer as sec

^{2}x but my textbook says the ans is [itex]\frac{tanx}{|tanx|}[/itex]sec

^{2}x

why??

please help