Answer
See below.
Work Step by Step
If we are using half angle formulas for $\sin(A/2)$ or $\cos(A/2)$, the radical's sign indicates which quarter $A/2$ will be in.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 5 - Section 5.4 - Half-Angle Formulas - 5.4 Problem Set - Page 303: 1
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