# Trig idents

1. Oct 25, 2005

### Phymath

this had some projectile physics but the problem boils down to...

show...
$$\frac{1-sin \beta}{cos^2 \beta} = \frac{1}{1+sin \beta}$$

no idea..

2. Oct 25, 2005

### Staff: Mentor

Try using the simplest trig identity of them all:
$$\sin^2 \theta + \cos^2 \theta = 1$$

3. Oct 25, 2005

### gravenewworld

worse comes to worse, you could always represent cos and sin in their complex number forms and just treat the problem as a simple algebra problem.

4. Oct 26, 2005

### Gokul43201

Staff Emeritus
Use Doc's suggestion and the answer will pop right out in just one step.

PS : Next time, post a question like this under Pre-calculus math.