In mathematics, the domain (sometimes called the source) of a given function is the set of "input" values for which the function is defined.[1] For instance, the domain of cosine would be all real numbers, while the domain of the square root would be only numbers greater than or equal to 0 (ignoring complex numbers in both cases). In a representation of a function in a xy Cartesian coordinate system, the domain is represented on the x axis (or abscissa).

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