问题标题:
【(求步骤)化简:[sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]】
问题描述:

(求步骤)化简:[sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]

柳锦宝回答:
  [sin(-α-3/2π)cos(3/2π-α)·tan2(π-α)]/[cos(π/2-α)·sin(π/2+α)]   =[cosa(-sina)(-tan2a)]/[sina(-cosa)]   =-tan2a
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