Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 6 - Inverse Circular Functions and Trigonometric Equations - Section 6.1 Inverse Circular Functions - 6.1 Exercises - Page 265: 55



Work Step by Step

Ensuring that the calculator is in degree mode, we enter $\cot^{-1} (-0.60724226)$ as $\tan^{-1} (\frac{1}{-0.60724226})$ into the calculator and solve: $\tan^{-1} (\frac{1}{-0.60724226})\approx-58.732107^{\circ}$ Adding the solution to $180^{\circ}$: $180^{\circ}+(-58.732107)^{\circ}=121.267893^{\circ}$
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