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Functions

A function is an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable). In the equation y=f(x), x is the independent variable and y is the dependent variable.
The symbols f(x) (read as "f of x"), g(x), P(x), etc., are often used for functions of the independent variable x; the choice of using the letters f, g or P is arbitrary.
Functions involving more than two variables occur frequently in applications of mathematics.
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