Lemma
EasyDifferentiation rules
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §6.2 The Exponential e, #19 · Calculus · Differentiation rules

The difference between … and … is approximately

The difference between and is approximately . Subtract the calculated values for from to discover the number .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §6.2 The Exponential e, #19

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