化简（2cos^2x-1)(3cos^2x-1)/cos2x

分类: 作业答案 • 2021-12-28 15:56:49

问题描述：

答

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