Answer
$\cos{t}$;
$\sec{t}$;
even
Work Step by Step
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
