已知cos(a-b\2)=-1\9,sin(a\2-b)=2\3,且0
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已知cos(a-b\2)=-1\9,sin(a\2-b)=2\3,且0
已知cos(a-b\2)=-1\9,sin(a\2-b)=2\3,且0
已知cos(a-b\2)=-1\9,sin(a\2-b)=2\3,且0
∵cos(a-b/2)=-1/9,
0