Answer
$-\frac{\pi}{4}\ rad.$
Work Step by Step
Use the conversion $1^\circ = \frac{\pi}{180}\ rad$, we have $-45^\circ =-45\times \frac{\pi}{180}=-\frac{\pi}{4}\ rad.$
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 - Test - Page 650: 2
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