Trigonometry 7th Edition

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

Chapter 5 - Test - Page 315: 20

Answer

$\sin(90)$

Work Step by Step

We know that $\sin(A+B)=\sin A\cos B+\cos A\sin B$, thus $\sin 15\cos 75+\sin 75\cos 15=\sin(15+75)=\sin(90)$
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