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(a-b)^2 = a^2 + b^2
(ax+b)(cx+d) = acx^2 + adx + bcx +bd
(a+b)2=(a+b)(a+b)=a2+2ab+b2
(a-b)2=(a-b)(a-b)=a2-2ab+b2
(ax+b)(cx+d)=acx2+adx+bcx+bd