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August 29, 2015

Homework Help: Pre Calc

Posted by Pre Calc on Friday, November 13, 2009 at 2:40pm.

use properties of the trigonometric function to find the exact value of each expression. Do no use a calculator.

sec ( - pi/18) * cos (37 pi)/18

I do not see how to do this problem. Every time I do it out I get a reference angle of twenty degrees which isn't on the unit circle. I do it on my calculator and get answer of one. If you could show me how to do this problem that would be great. I think the part I'm getting stuck on is the - pi/8 there must be some other rule that I do not know about when there are negetives

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