((a+b)²-(a-b)²)/ab= ((a+b+a-b)*(a+b-a+b))/ab= (2a*2b)/ab= 4ab/ab= 4
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((a+b)²-(a-b)²)/ab= ((a+b+a-b)*(a+b-a+b))/ab= (2a*2b)/ab= 4ab/ab= 4