化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3
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化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2x
化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3
化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3
化简：cos^2x(2cos^2x+3)-sin^2x(2cos^2x+3)-4sin^2xcos^2x+3
现将各项都乘开,然后将sin^2x=1-cos^2x带入
得8cos^4x
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