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已知cos(π/6-θ)=1/2,则cos(5π/6+θ)=
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人气:447 ℃ 时间:2020-06-20 04:31:18
解答
cos(π/6-θ)=cos(π-(5π/6+θ)
=-cos(5π/6+θ)=1/2
所以
cos(5π/6+θ)=-1/2
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