## Trigonometry (11th Edition) Clone

$0.3887$
$\sec s=\frac{1}{\cos s}=1.0806$ $\frac{1}{\cos s}=1.0806$ can be rearranged to $\cos s=\frac{1}{1.0806}$ $\cos s=\frac{1}{1.0806}$ is further rearranged to $s=\cos^{-1} \frac{1}{1.0806}$ Ensuring that the calculator is in radians, we type $\cos^{-1} \frac{1}{1.0806}$ into the calculator and solve: $s=\cos^{-1} \frac{1}{1.0806}\approx0.3887$