cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2

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cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π

cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2
cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2

cos(x-y/2)=-1/9,sin(x/2-y)=2/3,π/2
因为π/2