SOLUTION: cos 2 theta cos 2 fi + sin^2(theta + fi) - sin^2( theta + fi)= cos(2 theta + 2 fi)

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Question 1117224: cos 2 theta cos 2 fi + sin^2(theta + fi) - sin^2( theta + fi)= cos(2 theta + 2 fi)
Answer by Alan3354(69443) About Me  (Show Source):
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cos 2 theta cos 2 fi + sin^2(theta + fi) - sin^2( theta + fi)= cos(2 theta + 2 fi)
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