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已知cos(π/6+θ)=根号3/3,求cos(5π/6-θ)的值
人气:464 ℃ 时间:2020-04-15 17:25:16
解答
cos(π/6+θ)=cos(-(π/6+θ))=-cos(-(π/6+θ)+π)=-cos(5π/6-θ)
所以:
cos(5π/6-θ)=-cos(π/6+θ)=-根号3/3.
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