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L'Hôpital's Rule was actually devised by Johann Bernoulli. It appeared in the first ever Calculus textbook, by Guillaume de L'Hôpital, thanks to an agreement: Bernoulli would inform L'Hôpital only of his latest findings in exchange for an annual payment of 300 Francs. #MathType https://t.co/ADKhEKjPQ9