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| Functions |
 Cartesian Coordinate System Domain and Range Inverse Functions Even-Odd Symmetry of Functions Periodicity of Functions
Exponential Functions Logarithmic Functions Natural Logarithms
Hyperbolic Functions |
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A function f ( x ) is called a periodic function if there exists a positive number T such that f ( x + T ) = f ( x ) for all x in the domain of f ( x ).The smallest number T is called the period of the function. All trigonometric functions are periodic functions. Example of a periodic function is shown in the figure below.
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