Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 7 - Exponential Functions - 7.8 Inverse Trigonometric Functions - Preliminary Questions - Page 374: 2



Work Step by Step

Take $\theta =0$; then $\cos 0=1$. Now, $\cos^{-1} 1=0, 2\pi, 4\pi,...$ This does not contradict the inverse function because the inverse cosine function values are restricted to $[0,\pi]$.
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