http://latex.codecogs.com/gif.latex?...plus;&space;1}

Thank you

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- Aug 1st 2012, 09:32 AMDanielleNYOne more trig identity please
- Aug 1st 2012, 12:21 PMHallsofIvyRe: One more trig identity please
What have

**you**done? Do you know identities for cos(2x) and sin(2x)? - Aug 1st 2012, 01:00 PMDanielleNYRe: One more trig identity please
Am I somewhat close?

http://latex.codecogs.com/gif.latex?...ce;+cosx} - Aug 1st 2012, 02:45 PMBeanRe: One more trig identity please
multiply that by (cos x+sin x)/(cos x+sin x)

Edit: oh, you were done two steps before. Expand the denominator.