As x tends towards 0 (from >0), log(x) tend to - infinity.
As x tends to + infinity so does log (x), though at a much slower rate.
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When you graph a tangent function, the asymptotes represent x values 90 and 270.
Not sure what non-verticle means, but a rational function can have up to 2 non-vertical asymptotes,
It is the logarithmic function.
No, it will always have one.
When you plot a function with asymptotes, you know that the graph cannot cross the asymptotes, because the function cannot be valid at the asymptote. (Since that is the point of having an asymptotes - it is a "disconnect" where the function is not valid - e.g when dividing by zero or something equally strange would occur). So if you graph is crossing an asymptote at any point, something's gone wrong.