Factorise ab(c^2+1)-c(a^2+b^2)
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given, ab(c 2+1)+c(a 2+b 2 )
=abc 2+ab+ca 2 +cb 2
=abc 2 +ca 2 +ab+cb 2
=ac(bc+a)+b(a+bc)
=(a+bc)(ac+b)
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