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x^2+2x-3 = (x+3)(x-1)
maka limit x menuju 1 (x+3)(x-1) / |x-1|
limit x menuju 1 (x+3) = (1+3) = 4
limit ------------------ = limit -------------------
x-->1 x - 1 x-->1 x - 1
= limit (x + 3)
x ->1
= 1 + 3
= 4