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: $s=\cos^{-1} (\frac{1}{4.5600})\approx1.3497$
