December 1, 2015

Homework Help: Trig

Posted by Trig on Tuesday, November 3, 2009 at 8:27pm.

How come cosine of 225 degrees is a positive number i thought it was negative because it's reference angle would be 45 degrees below the second quadrant and in a unit circle cosine is just the x value so I thought cosine of something in both the second and third were negative

apparently i'm wrong please explain

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