Answer
$92.9^\circ$
Work Step by Step
Given $tan\theta=-20$, and $0^\circ\lt\theta\lt180^\circ$,
we can identify that $\theta$ is in Quadrant II.
Use a calculator we can find that $\theta=tan^{-1}(-20)=92.9^\circ$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Section 6.4 - Inverse Trigonometric Functions and Right Triangles - 6.4 Exercises - Page 507: 26
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