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化简tanθ-1分之sinθ-cos等于
人气:184 ℃ 时间:2020-05-21 10:57:09
解答
(sinθ-cosθ)/(tanθ-1)
=(sinθ-cosθ)/(sinθ/cosθ-1)
=(sinθ-cosθ)/[(sinθ-cosθ)/cosθ]
=cosθ
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