# Periodic function/Related Articles

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*See also changes related to Periodic function, or pages that link to Periodic function or to this page or whose text contains "Periodic function".*

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- Exponential function [r]: Function of real or complex variable with the property that the function is equal to its first derivative.
^{[e]} - Fourier series [r]: Infinite series whose terms are constants multiplied by sine and cosine functions and that can approximate a wide variety of periodic functions.
^{[e]} - Functional equation [r]: A relation between the values of a function at different points, such as periodicity or symmetry.
^{[e]} - Mathematical notation [r]: A system of symbolic representations of mathematical objects and ideas.
^{[e]} - Trigonometric function [r]: Function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, and cosecant.
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