Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Appendix A - Section A.2 - The Inverse of a Function - A.2 Problem Set - Page 497: 38

Answer

See below.

Work Step by Step

a) There are $y$ values (5,4) that don't belong to a unique $x$, thus it won't pass the horizontal line test, hence it is not one-to-one. b) There are no $y$ values that don't belong to a unique $x$, thus it will pass the horizontal line test, hence it is one-to-one.
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