cos三分之二派等于多少
问题描述:
cos三分之二派等于多少
答
答:
cos(2π/3)
=cos(π-π/3)
=-cosπ/3
=-1/2
cos三分之二派等于多少
答:
cos(2π/3)
=cos(π-π/3)
=-cosπ/3
=-1/2