Answer
$\dfrac{\pi}{3}$
Work Step by Step
To make the angle positive, we add $360^{\circ}$ twice:
$2*2\pi=4\pi=\dfrac{12\pi}{3}$
Thus, the reference angle is $- \dfrac{11 \pi}{3}+\dfrac{12 \pi}{3}=\dfrac{\pi}{3}$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Review Exercises - Page 645: 56
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