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化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
人气:207 ℃ 时间:2020-07-13 03:29:39
解答
(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
=(-cosα) (tanα) (-tanα)/(-sinα)
=-tanα
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