化简(2cos^2x-1)(3cos^2x-1)/cos2x

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化简(2cos^2x-1)(3cos^2x-1)/cos2x化简(2cos^2x-1)(3cos^2x-1)/cos2x化简(2cos^2x-1)(3cos^2x-1)/cos2x(2cos^2x-1

化简(2cos^2x-1)(3cos^2x-1)/cos2x
化简(2cos^2x-1)(3cos^2x-1)/cos2x

化简(2cos^2x-1)(3cos^2x-1)/cos2x
(2cos^2x-1)(3cos^2x-1)/cos2x
=cos2x(3cos^2x-1)/cos2x
=3cos^2x-1
=cos^2x+(2cos^2x-1)
=cos^2x+cos2x