f(x)=2[(sinx)^4+(cosx)^2]+cos²2x-3=2[(sin²x+cos²x)²-2sin²xcis²x]+cos²2x-3=2(1-2sin²xcos²x)+cos²2x-3=2-(2sinxcosx)²+cos²2x-3=-sin²2x+cos...
f(x)=(2sin^4 x）+(2cos^4 x)+(cos^2 2x） -3 化简
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