Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - Review Exercises - Page 553: 81


False. $cos\frac{θ}{2}\gt0$

Work Step by Step

If $\frac{\pi}{2}\ltθ\lt\pi$, then $\frac{\pi}{4}\lt\frac{θ}{2}\lt\frac{\pi}{2}$. That is, $\frac{θ}{2}$ is in the Quadrant I. So: $cos\frac{θ}{2}\gt0$
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