Lemma
MediumDifferentiation rules
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §6.4 Logarithms, #50 · Calculus · Differentiation rules

Estimate to linear accuracy, then quadratic accuracy, by . Then use a calculator.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §6.4 Logarithms, #50

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