in-verse function

inverse function

noun Mathematics.
the function that replaces another function when the dependent and independent variables of the first function are interchanged for an appropriate set of values of the dependent variable. In y = sin x and x = arc sin y, the inverse function of sin is arc sine.

Origin:
1810–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
inverse function

noun
a function obtained by expressing the dependent variable of one function as the independent variable of another; f and g are inverse functions if f(x)=y and g(y)=x 
WordNet® 3.0, © 2006 by Princeton University.
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