化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
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化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))化简:(cos(π-α)tan(
化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
化简:(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
(cos(π-α)tan(α-2π)tan(2π-α))/(sin(π+α))
=(-cosα) (tanα) (-tanα)/(-sinα)
=-tanα
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