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**L'Hôpital's rule:**

In mathematics, and more specifically in calculus,** L'Hôpital's rule** or **L'Hospital's rule** *(French: [lopital])* uses derivatives to help evaluate **limits** involving **indeterminate forms.** Application (or repeated application) of the rule often converts an indeterminate form to an expression that can be evaluated by substitution, __allowing easier evaluation of the limit.__

The rule is named after the **17th-century **French mathematician__ Guillaume de l'Hôpital__. Although the contribution of the rule is often attributed to