# Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.7 Apply Double-Angle and Half-Angle Formulas - 14.7 Exercises - Skill Practice - Page 959: 2

#### Work Step by Step

1) The trigonometric function $Sine$ is positive in the First and Second Quadrant. 2) The trigonometric function $Cosine$ is positive in the First and Fourth Quadrant.

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