University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 5 - Section 5.2 - Sigma Notation and Limits of Finite Sums - Exercises - Page 299: 3



Work Step by Step

$\sum\limits_{k=1}^4cos k\pi=cos (1\cdot\pi)+cos(2\cdot\pi)+cos (3\cdot\pi)+cos(4\cdot\pi)=-1+1-1+1=0$
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