Limit: LIM (x - > 4) (x ^ 2-6x + 8) / (x ^ 2-5x + 4)
Limit: LIM (x - > 4) (x ^ 2-6x + 8) / (x ^ 2-5x + 4) / /: 0 / 0 type infinitive: use lobita's rule;
=lim(x->4) (2x-6)/(2x-5)
=2/3
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