cos(3π/2 - π/3),求值
问题描述:
cos(3π/2 - π/3),求值
答
-√3/2
答
解cos(3π/2 - π/3)
=cos(π+π/2 - π/3)
=-cos(π/2 - π/3)
=-sin(π/3)
=-√3/2.