Answer
True
Work Step by Step
Figure 37 shows that the graph of $y=\sec{x}$ is symmetric with respect to the y-axis.
This means that the value of $y=\sec{x}$ when $x=-\pi$ is the same as its value when $x=\pi$, and this is true for all non-zero values of $x$.
Therefore, $\sec{x} = \sec{(-x)}$.