ab-ac-cd-bd
factorise
khanujarashmit:
I think there is a sign mistake plz check it again and repost
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ab-bd-ac-cd
b(a-d) -c(a+d)
(b-c)(a-d) (a+d)
b(a-d) -c(a+d)
(b-c)(a-d) (a+d)
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