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: 67

Answer

$2.4605221$ radian

Work Step by Step

Ensuring that the calculator is in radian mode, we enter $\sec^{-1} (-1.2871684)$ as $\cos^{-1} (\frac{1}{-1.2871684})$ into the calculator and solve: $y=\cos^{-1} (\frac{1}{-1.2871684})\approx2.4605221$ radian
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