问题标题:
化简:cos(2π-α)sin(-π-α)/sin(π/2+α)tan(3π-α)
问题描述:
化简:cos(2π-α)sin(-π-α)/sin(π/2+α)tan(3π-α)
崔志华回答:
cos(2π-α)sin(-π-α)/sin(π/2+α)tan(3π-α)
=cosαsinα/-(cosαtanα)=-cosα
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