cos(2a-b)=-11/14,sin(a-2b)=4根号3/7,0
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cos(2a-b)=-11/14,sin(a-2b)=4根号3/7,0
cos(2a-b)=-11/14,sin(a-2b)=4根号3/7,0
cos(2a-b)=-11/14,sin(a-2b)=4根号3/7,0
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已知cos(2a-b)=-11/14,sin(a-2b)=4√3/7,0