Answer
In (a), $\large cos\theta<0$ which implies $\large \theta$ lies in the second or third quadrant.
In (b), $\large sin\theta<0$, which implies $\large \theta $ lies in the third or fourth quadrant.
Work Step by Step
The answer:
Calculus, 10th Edition (Anton)
by Anton, Howard
Published by
Wiley
ISBN 10:
0-47064-772-8
ISBN 13:
978-0-47064-772-1
Appendix B - Trigonometry Review - Exercise Set B - Page A24: 20
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