factorise 4a^2b^2 -(a^2+b^2-c^2)
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Answer:
(a^ +b^−c^) 2 −4a^b^
⇒(a^ +b^−c^)^−(2ab)^
⇒(a^+b^−c^+2ab)(a^+b^−c^−2ab)
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