Hey everyone,

I'm asked to graph .

So I graphed it and everything. But now I need to find an equation of this line in terms of X and Y.

So here is what I did:

So I figured that this must be some kind of trig identity and after checking up on wikipedia sure enough this gives me:

So given my domain of I get:

Basically what I'm wondering is if there is a quick derivation to go from to , or if am alright in just saying it's an identity.

Thanks,

TrevorP