What is 'L'Hopital's Rule'?

What is 'L'Hopital's Rule'?

Approach: Explain evaluating limits of indeterminate forms.

A rule stating that if a limit results in an indeterminate form (0/0 or ∞/∞), the limit of the ratio of the functions is the same as the limit of the ratio of their derivatives.

Follow-up: When does the rule fail?

Key concepts: derivative, indeterminate form, 0/0.