Add X2 - 2xy +3y2 and 5y2 +3xy -6x2 in a row method
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(x+y+z+w)2 = x2 +y2 + z2 +w2 +2xy+2xz+2xw+2yz+2yw+2zw ... (x+y) 3 = (x+y)(x2 +y2 +2xy) = x3 +y3 +3xy(x+y).
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