Answer
$0$
Work Step by Step
$\sum\limits_{k=1}^4cos k\pi=cos (1\cdot\pi)+cos(2\cdot\pi)+cos (3\cdot\pi)+cos(4\cdot\pi)=-1+1-1+1=0$
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
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
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