问题描述: 化简cos^4角+sin^2角cos^2角+sin^2角 1个回答 分类:数学 2014-12-07 问题解答: 我来补答 =(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 展开全文阅读