Answer
$-1$
Work Step by Step
$\cos{180^\circ}-\sin{180^\circ}=\cos{\pi}-\sin{\pi}=-1-0=-1$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.2 Trigonometric Functions: Unit Circle Approach - 6.2 Assess Your Understanding - Page 379: 34
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