Answer
$-\frac{\pi}{4}$.
Work Step by Step
We know that $\tan{-\frac{\pi}{4}}=-1$, the inverse tangent function gives back the argument, hence the answer is $-\frac{\pi}{4}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 9 - Polar Coordinates; Vectors - 9.1 Polar Coordinates - 9.1 Assess Your Understanding - Page 571: 4
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