{sin(π-α)cos[(3π/2)-α]tan(π-α)}/{sin(2π-α)cos(π-α)tan(3π+α)}=[sinα(-sinα)(-tanα)]/[-sinα(-cosα)*tanα]=sinα/cosα=tanα如果您认可我的回答,请点击“采纳为满意答案”,谢谢!