## Calculus: Early Transcendentals 8th Edition

F'(s) = $\frac{1}{s\times lns}$
We use the rule for taking the derivative of a natural log to obtain: F'(s) = $\frac{(lns)'}{lns}$ F'(s) = $\frac{\frac{1}{s}}{lns}$ F'(s) = $\frac{1}{s\times lns}$