Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 6 - Inverse Circular Functions and Trigonometric Equations - Section 6.1 Inverse Circular Functions - 6.1 Exercises - Page 259: 57

Answer

$-82.678329^{\circ}$

Work Step by Step

Ensuring that the calculator is in degree mode, we enter $\tan^{-1} (-7.7828641)$ into the calculator and solve: $\tan^{-1} (-7.7828641)\approx-82.678329^{\circ}$
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