Answer
$1$
Work Step by Step
$0$ is a special angle that intersects the unit circle at the point $(1, 0)$.
Since $\cos{\theta}=x$, then
$\cos{0} =1$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises - Page 587: 2
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