Trigonometry 7th Edition

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

Chapter 5 - Section 5.2 - Sum and Difference Formulas - 5.2 Problem Set - Page 288: 24

Answer

See the steps.

Work Step by Step

$\cos{(90+\theta)} = \cos{90} \cos{\theta} - \sin{90} \sin{\theta} $ $\cos{(90+\theta)} = 0 \times \cos{\theta} - 1 \times \sin{\theta} = - \sin{\theta}$
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