Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 6 - Section 6.3 - Trigonometric Functions of Angles - 6.3 Exercises - Page 501: 74

Answer

Mistake made by the partner is that he has used the calculator in degree mode.

Work Step by Step

Before we punch the keys of a calculator to calculate the value of a trigonometric function, we must set it to the right mode, i.e. degree or radian as per the requirement.
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