化简：[tan(π-α)/sin(π-α)sin(3/2π-α)] + [ sin(2π-α)(cosα-3/2π)/sin(3/2π+α)cos(2π-α)]
化简：[tan(π-α)/sin(π-α)sin(3/2π-α)]+[sin(2π-α)(cosα-3/2π)/sin(3/2π+α)cos(2π-α)]...
化简：[tan(π-α)/sin(π-α)sin(3/2π-α)] + [ sin(2π-α)(cosα-3/2π)/sin(3/2π+α)cos(2π-α)]
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tan(π-α)/[sin(π-α)sin(3/2π-α)] + [sin(2π-α)cos(α-3/2π)/[sin(3/2π+α)cos(2π-α)]
=-tanα/[sinα(-cosα)]+(-sinα)(-sinα)/[-cosα(cosα)]
=1/(cosα)^-(sinα)^/(cosα)^
=[1-(sinα)^]/(cosα)^
=1.
=-tanα/[sinα(-cosα)]+(-sinα)(-sinα)/[-cosα(cosα)]
=1/(cosα)^-(sinα)^/(cosα)^
=[1-(sinα)^]/(cosα)^
=1.
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