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# Chapter 2. Trigonometry

• 2.1 Introduction

• 2.2 General Trigonometric Functions

• 2.3 Addition, Subtraction, and Multiplication of Two Angles

• 2.4 Oblique Triangles

• 2.5 Graphs of Cosine, Sine, Tangent, Secant, Cosecant, and Cotangent

• 2.6 Relationship between Trigonometric and Exponential Functions

• 2.7 Hyperbolic Functions

# Introduction

• Trigonometry involves the measurement of triangles. Trigonometry includes the measurement of angles, lengths, and arc lengths of triangles in circles and planes and also in spheres. Trigonometry is used in engineering, navigation, the study of electricity, light and sound, and in any field involving the study of periodic and wave properties.

Trigonometric functions can be defined using ratios of sides of a right triangle and, ...

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