Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - 7.3 Sum and Difference Identities - 7.3 Exercises: 59

Answer

$1$

Work Step by Step

$\sin \dfrac {\pi }{5}\cos \dfrac {3\pi }{10}+\cos \dfrac {\pi }{5}\sin \dfrac {3\pi }{10}=\sin \left( \dfrac {\pi }{5}+\dfrac {3\pi }{10}\right) =\sin \dfrac {\pi }{2}=1$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.