Indeterminate Forms and L’Hôpital’s Rule — Cheat sheet

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Core rule

For an eligible 0/00/0 or infinite-over-infinite quotient, a limiting derivative ratio f′/g′f'/g' determines f/gf/g under L’Hôpital's hypotheses.

Watch for

Differentiate numerator and denominator separately, not with the quotient rule. Transform products/powers first and recheck every repeated application.