cos²a-cos²b=c,则sin(a+b)sin(a-b)=

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cos²a-cos²b=c,则sin(a+b)sin(a-b)=
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cos²a-cos²b=c,则sin(a+b)sin(a-b)=
cos²a-cos²b=c,则sin(a+b)sin(a-b)=

cos²a-cos²b=c,则sin(a+b)sin(a-b)=