6 The Circular Functions and Their Graphs Phenomena that repeat in a regular pattern, such as average monthly temperature, fractional part of the moon’s illumination, and high and low tides, can be modeled by periodic functions. 6.1 Radian Measure 6.2 The Unit Circle and Circular Functions 6.3 Graphs of the Sine and Cosine Functions 6.4 Translations of the Graphs of the Sine and Cosine Functions Chapter 6 Quiz 6.5 Graphs of the Tangent and Cotangent Functions 6.6 Graphs of the Secant and Cosecant Functions Summary Exercises on Graphing Circular Functions 6.7 Harmonic Motion 593
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