# Confused! Pre-Cal

posted by
**Anonymous**
.

Verify that each equation is an identity..

tan A= sec a/csca

I have notes (i wasn't here that day and teacher refuses to reteach) but I don't understand them here is the notes...

Problem w/ same directions:

Cos x= cotx/csc x

= Cosx/Sin x / 1/sinx = cosx

I just don't get this?!?!

What don't you understand?

To prove Cos x = cotx/csc x,

Just rewrite it as

(Cosx/Sin x) / (1/sinx) = cosx

It is just algebra.

Similarly,

tan a = sin a/cos a

= (1/csc a)/(1/sec a) = sec a/csc a