# Simplifying a trigonometric expression.

• October 16th 2010, 12:45 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!
• October 16th 2010, 12:52 PM
Quote:

Originally Posted by JennyFlowers
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!

Use

$Cos^2x+Sin^2x=1\Rightarrow\ Cos^2x=1-Sin^2x=(1+Sinx)(1-Sinx)$