factorise 1+2ab-(a^2+b^2)
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1+2ab-(a^2+b^2)
=1-(a^2+b^2-2ab)
=1^2-(a -b)^2
=(1+a -b)(1-a+b)
=1-(a^2+b^2-2ab)
=1^2-(a -b)^2
=(1+a -b)(1-a+b)
paglu1:
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