FSMQ trig identities

I have done a few past papers in which multiple different trig questions come up asking about angles. I know the identity
cos^2 +sin^2= 1, but what other trig identities do we need to know and how to implement them?

Reply 1

stilllearning123

Original post

by freshforge23

You need to know how to rearrange them as in you have your original one cos^2+sin^2=1,
then you can change it into cos^2 = 1 - sin^2
as well as sin^2 = 1- cos^2

The other one you need to know is tan, which is just tan=sin/cos and you don't really do any rearranging with that.

Any more questions, I'll try my best to help!