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已知cos(30°+α)=根号3/3,则cos(150°-α)等于
人气:415 ℃ 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
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