Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 1 - Test - Page 51: 16

Answer

Q II or Q III

Work Step by Step

From Definition I, we know that- $\cos\theta$ =$ \frac{x}{r}$ Hence for $\cos\theta$ to be negative, x must be negative as r being a distance cannot be negative. x is negative in Q II and Q III only, Therefore if $\cos\theta$ is negative, $\theta$ can terminate in Q II or Q III only.
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