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How to find vertical and horizontal asymptotes calculus?

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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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