Answer
$\frac{\pi}{3}$
Work Step by Step
If $cos(s)=\frac{1}{2}$, we can find $s=\frac{\pi}{3}$ in the interval $[0,\frac{\pi}{2}]$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises - Page 587: 6
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