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3cos^2 2x + 7sin2x - 3 = 0. 3sin 2 x+7cos2x-3=0. Cos2x-3sin(-x)-2=0. Sin2x+2cos2x=0.
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3cos^2 2x + 7sin2x - 3 = 0. 3sin 2 x+7cos2x-3=0. Cos2x-3sin(-x)-2=0. Sin2x+2cos2x=0.