Factorise 1-2ab-(a^2+b^2).
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1-2ab-(a^2+b^2)
while changing the signs,
a^2+b^2+2ab-1
=(a+b)^2-(1)^2
=(a+b-1)(a+b+1) ans THANKS
while changing the signs,
a^2+b^2+2ab-1
=(a+b)^2-(1)^2
=(a+b-1)(a+b+1) ans THANKS
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