Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 11 - Infinite Sequences and Series - 11.1 Exercises - Page 724: 35

Answer

Divergent

Work Step by Step

By definition cos(n/2) is a sinusoidal function. It also follows that a sinusoidal function is oscillating. Therefore the limit DNE and it is divergent.
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