# Math Help - Unit Circles

1. ## Unit Circles

I have a couple questions when it comes to this, but it say to find the
cos ( -270 ).

I think the coordinates are ( 0, 1 ) idk what to do after this.

2. Find a coterminal for -270 between 0 and 360.

$-270 + 360 = 90$

From the unit circle, $\cos{90}$ is 0, because, as you said, the coordinates are (0,1). The points are in this form:

$P(\cos\theta, \sin\theta)$

3. wouldnt it just be zero then? cuz cos is focused on the x...and its ( 0, 1 )

4. Originally Posted by Chop Suey
From the unit circle, $\cos{90}$ is 0
..

5. oh im sorry i read what you wrote wrong. lol sorry!