作业帮sin(3/2π-α)= cos(3/2π-α)=
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sin(3/2π-α)= cos(3/2π-α)=
sin(3/2π-α)= cos(3/2π-α)=
sin(3/2π-α)= cos(3/2π-α)=
sin(3/2π-α)=-cosα
cos(3/2π-α)=-sinα