Answer
$tan~x \approx x$ for small values of $x$
Work Step by Step
When we compare the graphs of $y = tan~x$ and $y = x$ in the interval $[-1, 1]$, we can see that $tan~x \approx x$ for small values of $x$.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 4 - Graphs of the Circular Functions - Section 4.3 Graphs of the Tangent and Cotangent Functions - 4.3 Exercises - Page 168: 48
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