问题描述: 设cos(π/4+α)=-√3/2(π/2 1个回答 分类:数学 2014-12-01 问题解答: 我来补答 cos(π/4+α)=-√3/2, sin(π/4+α)=√[1-cos^2(π/4+α)]=1/2.【π/2 展开全文阅读