# Help with trigonometric integration problem

1. Aug 4, 2012

### stonecoldgen

The problem is to find $\int$(cos5x)/($\sqrt{sinx}$)

I rewrote cos5x as cosx(1-sin2x)2, finally getting:

(cosx-2cosxsin2x+cosxsin4x)/$\sqrt{sinx}$

and I don't even know if this is the correct path, so, any advice would be appreciated.

2. Aug 4, 2012

### rock.freak667

Re-write your integral replacing cos5x with what you have in your second line.

Now if you put t=sinx, what is dt?

3. Aug 4, 2012

### stonecoldgen

Thanks! I have the answer!

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