## Precalculus (6th Edition) Blitzer

Published by Pearson

# Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Concept and Vocabulary Check: 6

#### 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

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