化简cos^4角+sin^2角cos^2角+sin^2角

分类: 作业答案 • 2021-12-18 16:38:53

问题描述：

答

=(cos^2(x))^2+sin^2(x)cos^2(x)+sin^2(x)
=cos^2(x)(sin^2(x)+cos^2(x))+sin^2(x)
=cos^2(x)+sin^2(x)
=1