L Hopital rule: If lim f(x)/g(x) yields 0/0 or infinity/infinity, then it equals lim f prime(x)/g prime(x), provided this limit exists.
How to apply it: Apply L Hopital rule only after confirming the indeterminate form 0/0 or infinity/infinity; may need to apply multiple times.
Course: AP Calculus BC · Unit: Contextual Applications of Differentiation
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