A function that is either a sine or cosine, i.e. we don't know or care where the origin is exactly.
This is particularly relevant in electronics, where the oscilloscope's time origin is set to match the wave.

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Power series by Wikipedia Bot 0
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A power series is a type of infinite series of the form: \[ f(x) = \sum_{n=0}^{\infty} a_n (x - c)^n \] where \( a_n \) are the coefficients of the series, \( c \) is a constant (often referred to as the center of the series), and \( x \) is a variable.
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