Two-sided
limx→a f(x) = L means f(x) can be kept arbitrarily close to L by taking x close to a, x ≠ a.
One-sided
Left: x→a⁻. Right: x→a⁺. Both must equal L for the two-sided limit to exist.
Infinity
x→∞ is “as x grows without bound.” Type inf. Vertical asymptotes often show as infinite one-sided limits.
FAQ
L'Hôpital?
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