## Trigonometry (11th Edition) Clone

Published by Pearson

# Chapter 3 - Review Exercises - Page 136: 56

#### Answer

$1.3497$

#### Work Step by Step

Step 1: We ensure that the calculator is in radian mode. Step 2: $\sec s=\frac{1}{\cos s}=4.5600$ Step 3: $\cos s=\frac{1}{4.5600}$ Step 4: $s=\cos^{-1} (\frac{1}{4.5600})$ Step 5: Using the inverse cosine function in the calculator, we type $\cos^{-1} (\frac{1}{4.5600})$ into the calculator and solve. Step 6: $s=\cos^{-1} (\frac{1}{4.5600})\approx1.3497$

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