I need proof of this theorem.
Theorem: A straight line $y=c$ is an asymptote of a curve $f(x,y)=0$ iff $y - c$ is a factor of the co-efficient of the highest power of $x$ in $f (x,y)$.
2026-03-25 15:39:50.1774453190
Asymptotes Parallel to the axes.
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