已知sin(π+α)=-1/2则cos(α-3π/2)等于多少?
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已知sin(π+α)=-1/2则cos(α-3π/2)等于多少?
已知sin(π+α)=-1/2则cos(α-3π/2)等于多少?
已知sin(π+α)=-1/2则cos(α-3π/2)等于多少?
-1/2
sin(π+α)=-sinα=-1/2
cos(α-3π)=sin(1/2-α+3π/2)=sin(2π-α)=-sinα=-1/2