Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 2 - Review Exercises - Page 94: 12

Answer

In letter D, the angle $140^{\circ}$ has no reference angle that is a special angle.

Work Step by Step

All the trigonometric functions in A, B, and C can be solved using reference angles that are special. ($30^{\circ}, 45^{\circ}, 60^{\circ}, 90^{\circ}$) But, in letter D, the angle $140^{\circ}$ has no reference angle that is a special angle.
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