factories= 4a^2-4b² +4a +1
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4a2 -4b2 + 4a + 1
= 4a2 + 4a + 1 -4b2
=(2a) 2 + 2*2a*1 + 4b2
=(2a+1) 2- (2b)2
=(2a+1+2b) (2a+1-2b)
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