Trigonometry (11th Edition) Clone

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

Chapter 6 - Test - Page 293: 4c



Work Step by Step

Ensuring that the calculator is in degree mode, we enter $\cot^{-1} (-0.7125586)$ as $\tan^{-1} (\frac{1}{-0.7125586})$ into the calculator and solve to the nearest hundred: $\tan^{-1} (\frac{1}{-0.7125586})\approx-54.53^{\circ}$ Now adding the answer to $180^{\circ}$: $-54.53^{\circ}+180^{\circ}=125.47^{\circ}$ Therefore, $\cot^{-1} (-0.7125586)=125.47^{\circ}$
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