Answer
$\frac{2\pi}{3}$, $\frac{4\pi}{3}$
Work Step by Step
$\frac{1-\cos x}{1+\cos x}=3$
$1-\cos x=3(1+\cos x)$
$1-\cos x=3+3\cos x$
$4\cos x+2=0$
$4\cos x=-2$
$\cos x=-\frac{1}{2}$
$x=\frac{2\pi}{3}$, $\frac{4\pi}{3}$
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 7 - Review - Exercises - Page 578: 37
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