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  1. mathsisfun.com
    https://www.mathsisfun.com › sets › function

    What is a Function - Math is Fun

    A function relates an input to an output. It is like a machine that has an input and an output. And the output is related somehow to the input.

  2. britannica.com
    https://www.britannica.com › science › function-mathematics

    Function | Definition, Types, Examples, & Facts | Britannica

    Jul 11, 2025 · Function, in mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent …

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