# Math Help - Identity

1. ## Identity

find an expression that completes the identity,

cos^2x/1-sinx = ?

2. Originally Posted by jumpman23
find an expression that completes the identity,

cos^2x/1-sinx = ?
hint ... $\cos^2{x} = 1 - \sin^2{x}$ ... then factor

3. I'm still confused about what to do. How do you use this pythagorean identity with this?

4. Originally Posted by jumpman23
I'm still confused about what to do. How do you use this pythagorean identity with this?
factor $1-\sin^2{x}$ and see.

5. does it end up equaling 1?

6. $\frac{\cos^2{x}}{1 - \sin{x}} = \frac{1 - \sin^2{x}}{1 - \sin{x}} = \frac{(1 - \sin{x})(1 + \sin{x})}{1 - \sin{x}} = 1 + \sin{x}
$