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simplify c_1*sin 2x + c_2*cos 2x + 1/4 sin^2(2 x)+1/2 cos(2 x) cos^2(x)
simplify c_1*sin 2x + c_2*cos 2x + 1/4 sin^2(2 x)+1/2 cos(2 x) cos^2(x)
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