Answer
$\pi/4$
Work Step by Step
So we know that arcsin isn't defined for quadrant 2 values since $11\pi/4$ is the same as $3\pi/4$. So we look directly across the y axis to an equivalent input. That would be $\pi/4$.
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 - Section 5.5 - Inverse Trigonometric Functions and Their Graphs - 5.5 Exercises - Page 445: 42
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