asymptotes of ln(x)
Let's find the asymptotes of ln(x), for real x
The function is defined on (0, +∞): a vertical asymptote can only be at a finite bound of this domain
As x approaches 0 from the right, the function tends to -∞
The function tends to infinity: the line x = 0 is a vertical asymptote
As x tends to +∞, the function tends to +∞ and f(x)x tends to 0: no horizontal or slant asymptote at +∞
▶Asymptotes:   x = 0
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