cos(π-α)tan(2π-α)tan(π-α)/sin(π+α) 化简
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cos(π-α)tan(2π-α)tan(π-α)/sin(π+α)化简cos(π-α)tan(2π-α)tan(π-α)/sin(π+α)化简cos(π-α)tan(2π-α)tan(π-α)/si
cos(π-α)tan(2π-α)tan(π-α)/sin(π+α) 化简
cos(π-α)tan(2π-α)tan(π-α)/sin(π+α) 化简
cos(π-α)tan(2π-α)tan(π-α)/sin(π+α) 化简
cos(π-α)tan(2π-α)tan(π-α)/sin(π+α)
=-cosα(-tanα)(-tanα)/(-sinα)
=tanαtanα/tanα
=tanα
sin(2π-α)tan(α+3π)tan(-α-π)/tan(α-3π)cos(π-α)
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cos(π-α)tan(2π-α)tan(π-α)/sin(π+α) 化简
求证:tanα+1/tan(π/4+α/2)=1/cosα帮个忙!
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