I think I am going to start helping people in algebra or something to earn my keep here. Anyways, here is the one I am workin on.

Find where graph of y= cosx/ (1+sinx) has horizontal tangent lines on the interval (0, pi/2)

I have simplified the derivative down to:

(-sinx-cos^2x)/ (1+ sinx) and I know that i need to find where x = 0 i am just at a loss as to how to find it. Any help is greatly appreciated, as always.

Thanks

Jordan