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Sin(π÷6-α)=a,求cos(2π/3-α)
人气:299 ℃ 时间:2020-05-20 20:55:28
解答
因为cos(π/2+α) =-Sin(π/+α)
cos(2π/3-α) =cos[π/2+(π/6-α)]
=-Sin(π/6-α)=-a
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