> 数学 >
已知cos(30°+α)=根号3/3,则cos(150°-α)等于
人气：492 ℃　时间：2020-03-10 18:49:38
解答
cos(30°+α)=√3/3
cos(150°-α)
=cos(180°-(30°+α) )
=-cos(30°+α)
=-√3/3
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版