4.3.2. Periodic Functions. Functions that repeat themselves over a particular intervalof their domain are periodic functions. The interval is calledthe period of the function.. The amplitude of a periodic function is one half the distancebetween the maximum and minimum values.. To graph a periodic function such as sin x, use the exact valuesof the angles of 300, 450, 600 900, 1800, 2700 and 3600 ..
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