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October 21, 2014

Homework Help: precalculus

Posted by ama on Friday, July 6, 2012 at 2:14am.

write each expression as the sine, cosine or tangent of a double angle. then find the exact value of the expression.

a. 2sin 22.5 cos 22.5

b. cos^2 105- sin^2 105

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