Answer
-1
Work Step by Step
Since sine is an odd function, $\sin(-90^{\circ})=-\sin(90^{\circ})$.
As $90^{\circ}$ is a special trigonometric angle where $\sin(90^{\circ})=1$,
$\sin(-90^{\circ})=-1$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 4 - Section 4.1 - Basic Graphs - 4.1 Problem Set - Page 192: 42
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