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已知cos(π/6—a)=m(m≤1),求sin(2π/3-a)的值
急!在线等!
人气:110 ℃ 时间:2020-05-13 08:10:55
解答
sin(2π/3-a)
=cos[π/2-(2π/3-a)]
=cos(-π/6+a)
=cos[-(π/6-a)]
=cos(π/6-a)
=m
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