(a\2-b)^2-1\4(a+b)(a-b)
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(a\2-b)^2-1\4(a+b)(a-b)
(a\2-b)^2-1\4(a+b)(a-b)
(a\2-b)^2-1\4(a+b)(a-b)
-ab+(5/4)b^2
(a/2-b)^2-1/4(a+b)(a-b)
=a²/4-ab+b²-a²/4+b²/4
=5b²/4-ab