hello : 1 ) if : xـــــــ> ± ∞ limf(x) = b ....(b∈R) so : y=b is the equation of the line horizontal asymptote. 2) if : xـــــــ> a ...(a∈R) limf(x) = ± ∞ so : x=a is the equation of the line vertical asymptote.
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