Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 3 - Differentiation - 3.1 Definition of the Derivative - Preliminary Questions - Page 102: 4


The derivative of $\tan x $ at the point $ x=\pi/4$.

Work Step by Step

Since $ f^{\prime}(x) \approx \frac{f(x+h)-f(x)}{h}$, then by visual inspection, we can see that the given formula is the derivative of $\tan x $ at the point $ x=\pi/4$.
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