Answer
11a. 0
11b. undefined
Work Step by Step
11a. $cos\frac {9\pi} {2}$ is equivalent to $cos \frac {\pi}{2}$ (when you subtract $2\pi$ from $\frac {9\pi} {2}$)
= 0
11b. $sec\frac {9\pi} {2}$ is undefined since $sec(x)$ is $(cos(x))^{-1}$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 5 - Review - Exercises - Page 463: 11
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