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OpenStudy (anonymous):
Problem: (sinA - cosA) (1+1/2 sin2A) = Applying the double id formula: (sinA - cosA) (1+1/2 2sinA cosA) Multiplying both expressions within parenthesis: sinA + sin^2A cosA - cosA - sinA cos^2A. What happened to the numbers 1+1/2 2 above???
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