Answer
4
Work Step by Step
4$\Sigma$k=1 $(-1)^{k}$ cos k$\pi$=$(-1)^{1}$ cos 1$\pi$ +$(-1)^{2}$ cos(2$\pi$)+$(-1)^{3}$ cos(3$\pi$)+$(-1)^{4}$ cos(4$\pi$)
=-(-1)+1-1(-1)+1
=4
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 5: Integrals - Section 5.2 - Sigma Notation and Limits of Finite Sums - Exercises 5.2 - Page 265: 6
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