Answer
$-1$
Work Step by Step
We need to compute $\cos 180^{\circ} -\sin 180^{\circ}$.
We use the unit circle values ($\cos{180^{\circ}}=-1$ and $\sin{180^{\circ}}=0$) to simplify as follows:
$\cos 180^{\circ} -\sin 180^{\circ} \\=-1-0 \\=-1$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.2 Trigonometric Functions: Unit Circle Approach - 5.2 Assess Your Understanding - Page 402: 34
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