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Indeterminate Forms and L'Hopital's Rule in Calculus

This concept catalogs the seven indeterminate forms encountered when evaluating limits (0/0, ∞/∞, 0·∞, ∞ − ∞, 0⁰, ∞⁰, 1^∞) and establishes the general reduction strategy that converts each non-ratio form into a 0/0 or ∞/∞ ratio so that L'Hôpital's Rule can be applied. It relies on the formal statement of L'Hôpital's Rule (for indeterminate ratios, the limit of a quotient equals the limit of the quotient of derivatives, when that limit exists), the algebraic identity expressing any positive quantity as e raised to its natural log, and the continuity of the exponential function permitting a limit to be evaluated by passing it into the exponent. This belongs to single-variable calculus, within the theory of limits, extending L'Hôpital's Rule beyond its base case to a general framework for indeterminate-form resolution.