Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Appendix B - Trigonometry Review - Exercise Set B - Page A26: 66

Answer

We use this identity:

Work Step by Step

For part (b) we also consider a right-angled triangle. The final answer is:
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