Answer
no x-values.
Work Step by Step
Using a graphing calculator (see attached image), this is true for no x-values. This is not surprising since sine and cosine functions with an amplitude of 1 range from -1 to 1.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - Investigating Algebra Activity - 14.3 Investigating Trigonometric Identities - Draw Conclusions - Page 923: 5
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