# Chapter 14 Trigonometric Graphs, Identities, and Equations - Investigating Algebra Activity - 14.3 Investigating Trigonometric Identities - Draw Conclusions - Page 923: 5

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.

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