已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2
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已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2
已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S
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已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2
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(cosx)^2+(cosy)^2+2cosxcosy=1/3……②
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