Trigonometry 7th Edition

by McKeague, Charles P.; Turner, Mark D.

Published by Cengage Learning

ISBN 10: 1111826854

ISBN 13: 978-1-11182-685-7

Chapter 3 - Section 3.1 - Reference Angle - 3.1 Problem Set - Page 121: 3

Answer

positive

Work Step by Step

A reference angle always lies between 0° and 90° therefore all six trigonometric functions of that angle are positive. Thus To find a reference angle using the inverse keys on a calculator, we must always enter a positive value.

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