a2+b2/c2+d2=ab+ad-bc/bc+vd-ad
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Step-by-step explanation:
Thoughtfully split the expression at hand into groups, each group having two terms :
Group 1: a2 + 4bc
Group 2: -4ad + 4bc
Group 3: -b2 - c2
Pull out from each group separately :
Group 1: (a2 + 4bc) • (1)
Group 2: (ad - bc) • (-4)
Group 3: (b2 + c2) • (-1)
Looking for common sub-expressions :
Group 1: (a2 + 4bc) • (1)
Group 3: (b2 + c2) • (-1)
Group 2: (ad - bc) • (-4)
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