## Precalculus (6th Edition) Blitzer

$\cos{t}$; $\sec{t}$; even
RECALL: (1) $\cos{(-a)} =\cos{a}$ (2) $\sec{(-a)} = \sec{a}$ (3) A function $f$ is even if $f(-x) = f(x)$. Thus, using the rules listed above, the missing expressions in the given statements are ( in order) : $\cos{t}$; $\sec{t}$; even