Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 5 - Review - Exercises - Page 464: 50

Answer

$-5\pi/4$

Work Step by Step

Taking a quick glance at the unit circle tells us that cos x is negative in the 2nd quadrant and the value -1/2 is at $-5\pi/4$.
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