# Fundamental Identities

1. Dec 2, 2009

### SkiingAlta

1. The problem statement, all variables and given/known data
Okay, so this is some trig I learned last year but have since forgotten. If you can give me the first step, I can solve the rest on my own. The given statement is true and you have to prove why using Pythagorean Identities.

csc2$$\alpha$$-1 = cos2$$\alpha$$
________
csc2$$\alpha$$

2. Dec 2, 2009

### Anakin_k

The first step is to just divide the numerator on the left side by the denominator. Try it and you will see how it makes sense.

3. Dec 2, 2009

### Dick

You are a little wrong there. I don't have to prove it. YOU have to prove it. csc(alpha)=1/sin(alpha). Just try it. Ok?