Question

Determine P(cos 225°, sin 225°) on the unit circle. Verify that x2 + y2 = 1.

Answer 1

obviously, because x=rcos(Θ), and y=rsinΘ (in this case : r=1, Θ=225)
so, just show that cos^2 225 + sin^2 225 = 1
it is an identity in trigono right ?

Answer 2

Yeah I think so. I just started working on this and my teacher didnt really go into it alot and it has to be turned in by today.

Answer 3

ok, happy studying for today :)

Answer 4

lol thanks (: