- First important thing about L'Hospital's rule is how to pronounce it. "L'Hospital" is pronounced "low pea tall". The rule uses derivatives to help evaluate limits involving indeterminate forms.
- Application (or repeated application) of the rule often converts an indeterminate form to a simpler expression that can be evaluated by substitution.
- L'Hospital's rule states that for functions f and g which are differentiable on an open interval I except possibly at a point c contained in I, if...