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cos(π/6-α)=m,m绝对值小于等于1,求cos(5π/6+α)
人气:357 ℃ 时间:2020-06-13 13:15:43
解答
cos(5π/6+α)=-cos[π-(5π/6+α)]=-cos(π/6-α)
所以cos(5π/6+α)=-m
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