Answer
90 degrees or $\pi/2$
Work Step by Step
sin inverse is defined in the 1st and 4th quadrant. Thus we know that sin x is 1 at the top of the unit circle or 90 degrees,
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 464: 49
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