COS(540°）=多少 怎么计算
问题描述：
COS(540°）=多少 怎么计算
答
cos540°
=cos(360°+180°)
=cos180°
=-1
COS(540°）=多少 怎么计算
cos540°
=cos(360°+180°)
=cos180°
=-1