list identities using during factorisation
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(a+b) sq = a. sq + 2ab + b. sq
(a-b) sq = a. sq - 2ab + b. sq
a. sq-b. sq = (a+b) (a-b)
(a-b) sq = a. sq - 2ab + b. sq
a. sq-b. sq = (a+b) (a-b)
ABHAYSTAR:
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