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Old 04-28-2012   #1
Join Date: Apr 2012
Posts: 1
Default The Cosine Curve

Hi there I would like to know how to do the following questions without drawing a graph. What is the formula?

The question: Express each of the following in terms of the cosine of another angle between 0° and 180°

a) cos 20°
b) cos 85°

Thank you for any help!
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