Precalculus: Mathematics for Calculus, 7th Edition

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: 37



Work Step by Step

Suddenly the problem has changed from the previous ones. Now we have to think about the extent of our inverse functions. We know that in quadrant I and II we are okay for cos x . BUT NOT QUADRANT III! Therefore we must find a value in the defined quadrants that has the same value. This would be directly across the x axis from $7\pi/6$ to $5\pi/6$.
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