Mark M. answered • 10/03/17
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cos 15 = cos (45 - 30)
cos (45 - 30) = cos 45 cos 30 + sin 45 sin 30
Substitute values and simplify.
Imani W.
asked • 10/03/17Find the exact value of cos 15 degrees= sqrt(A)(sqrt(B)+1)/4...what is A and what is B?
I know how to get the answer, but for some reason, they want it in this format and I'm not sure how to do it this way.
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