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Definition of L'HOPITAL'S RULE
: a theorem in calculus: if at a given point two functions have an infinite limit or zero as a limit and are both differentiable in a neighborhood of this point then the limit of the quotient of the functions is equal to the limit of the quotient of their derivatives provided that this limit exists
Variants of L'HOPITAL'S RULE
L'Ho·pi·tal's rule or L'Hos·pi·tal's rule\ˌlō-pē-ˈtälz-\