(a+b) (c-d) + (a-b) (c+d) +2(ac+bd)
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Step-by-step explanation:
= ac-ad+bc-bd + ac+ad-bc-bd + 2ac+2bd
= ac+ac+2ac + ad-ad + bc-bc + 2bd-bd-bd
= 4ac + 0 + 0 + 2bd-2bd
= 4ac + 0 + 0 + 0
= 4ac
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