What is the fundamental identity used to prove csc2α - 1 = cos2α / csc2α?

[SkiingAlta]

Homework Statement

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$$\alpha$$

 

[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.

 

[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?