# How do you evaluate sec(sec^-1(1/3))?

The expression ${\sec}^{- 1} \left(\frac{1}{3}\right)$ means find $x$ so that $\sec x = \frac{1}{3}$. But for all real numbers $x$, $\sec x = \frac{1}{\cos x}$ has an absolute value greater than or equal to $1$.