Saturday
April 19, 2014

Homework Help: Sin/Cos

Posted by Joey on Sunday, December 2, 2007 at 9:34pm.

I'm having trouble with a concept. I don't understand how the answer was found.

1. Find three other angles, such that cos[beta] = cos [25].
Answers are -25, 335, -335.

In my Calc class, the teacher showed it by using a circle, with an angle. Can anyone please help me, via links or some explanation?

I would also appreciate it if an explanation was provided for sine.

1. Three other angles for
sin[beta] = sin[-65]
Answers are 295, -115, and 245.

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