Calculus: Basic Uses of L'Hopital's Rule

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In this lesson, we will look at applications of L'Hopital's rule, when to use it, what to watch out for, etc. When assessing limits, start by plugging in using substitution to evaluate them. If this gives you an indeterminate form, apply L'Hôpital's rule. The L'Hôpital rule is applicable to f(x) and g(x) if they are differentiable functions across an interval containing c, except possibly at c. If the limit as x approaches c of f(x)/g(x) produces the indeterminant form of 0/0 or (+-infinity)/(+-infinity), then the limit as x approaches c or f(x)/g(x) is equal to the limit as x approaches c of [the derivative of f(x)] / [the derivative of g(x)] provided the limit on the right exists or is infinite. L'Hôpital's rule can also be applied to one-sided limits and, as long as the limit is indeterminate, you can take the limit again if L'Hôpital's rule doesn't give you an answer the first time around (and you are again left with an indeterminate form as the limit). Note that the rule may mislead you if you misapply it to a limit that doesn't produce an indeterminate form.

Taught by Professor Edward Burger, this lesson was selected from a broader, comprehensive Calculus course.

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[RingenbergDeChuck]

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[Mindbitesdotcom]

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[emadrio]

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[samacumen]

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