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| Math Central | Quandaries & Queries |
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Question from Carter, a student: let cos B = a, find cos 2B and sin 2B in terms of a and hence confirm that |
Hi Carter,
Use the expressions for sin(A + B) and cos (A + B) that are in my response to Matt's question. Substitute A = B. Substitute the values you obtain into cos2(2B) + sin2(2B) and simplify.
Harley
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