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limit x approaches to 2.
(x+3)(x-1) /( x+1)^2 >0
= (2+3) (2-1) / (2+1)^2.
=5/9 >0
(x+3)(x-1) /( x+1)^2 >0
= (2+3) (2-1) / (2+1)^2.
=5/9 >0
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