Answer
$-1$
Work Step by Step
Here, $ x= -1$; $ r=1$
The trigonometric ratios are as follows:
$\cos \theta =\dfrac{x}{r}$
Then, we have $\cos (\pi) =\dfrac{-1}{1}=-1$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.4 - Trigonometric Functions of Any Angle - Exercise Set - Page 575: 9
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