Trigonometry

[IloveManUtd]

Given that sin 50 degrees = p, express sin 230 degrees and cos 50 degrees in terms of p.

 

[mmm4444bot]

Here are two identities for you to consider (angles in degrees).

sin(x + 180) = -sin(x)

cos(x) = ±sqrt[1 - sin^2(x)]