# Simplifying a trigonometric expression.

• Oct 16th 2010, 01:45 PM
JennyFlowers
Simplifying a trigonometric expression.
I'm sure this a has a simple solution, but I'm just not seeing where to start with this.

1 - $\frac{cos^2x}{1+sin x}$

Thank you so much!
• Oct 16th 2010, 01:52 PM
1 - $\frac{cos^2x}{1+sin x}$
$Cos^2x+Sin^2x=1\Rightarrow\ Cos^2x=1-Sin^2x=(1+Sinx)(1-Sinx)$