# Caculus Help : Integrating with trig identities?

1. Sep 4, 2010

### eay444

1. The problem statement, all variables and given/known data

integrate: sin (2x)/(1+sinx)

2. Relevant equations

(sin x)^2 + (cos x) ^2 = 1
sin (2x) = 2 sin x cos x
cos (2x) = (cos x)^2 - (sin x)^2

3. The attempt at a solution

I've been trying to integrate this thing for about an hour by rearranging various trig idenities with no luck. Am I missing something? I don't think this problem is supposed to be that hard. Someone please help!
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Sep 4, 2010

### tatiana_eggs

I would try first replacing sin (2x) with 2 sin x cos x then do u sub and let u = cos x. Try that and see if it helps

3. Sep 4, 2010

### eay444

I got it now, Thanks for your help.