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已知sin(π/3-X),则cos(5π/6-X)=?
人气:168 ℃ 时间:2020-05-27 18:10:21
解答
cos(5π/6-X)
=-cos[π-(5π/6-X)]
=-cos(x+π/6)
=-sin[π/2-(x+π/6)]
=-sin(π/3-X)
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