Answer
$\frac{\pi}{3},\frac{5 \pi}{3}$
Work Step by Step
Need to find the range for $x$ for the equation
$2cosx-1$
$2cosx=1$
$cosx=\frac{1}{2}$
Since, $cosx>0$ on first and fourth quadrant thus, x must lie on $\frac{\pi}{3},\frac{5 \pi}{3}$
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Appendix D - Trigonometry - D Exercises - Page A33: 65
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