Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - 7.5 Inverse Circular Functions - 7.5 Exercises - Page 709: 56



Work Step by Step

Make sure that the setting for angles is "degrees". $\cot^{-1}x$ is evaluated as $\left\{\begin{array}{lll} \tan^{-1}(1/x) & if & x > 0\\ 180^{o}+\tan^{-1}(1/x) & if & x <0 \end{array}\right.$ (x is negative here) Keys: "shift" or "2nd function" "tan" numerical keypad: (1$\div$(-2.7733744)) "=" numerical keypad: +180 "=" yields $160.172136947^{o}$
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