已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A

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已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A已知：锐角A,B满足cos(A+

已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A
已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A

已知：锐角A,B满足cos(A+B)=1/2,sin(A-B)=1/3,求cos2A
6分之根号2