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Usually, a function will be written with a formula for the output, in terms of the input. For example, in the case of f above, the formula is <math>f(x) = x^2</math>. When we want to input a particular value, we insert in in the place of x. So <math>f(1) = 1^2 = 1*1 = 1</math>.
Usually, a function will be written with a formula for the output, in terms of the input. For example, in the case of f above, the formula is <math>f(x) = x^2</math>. When we want to input a particular value, we insert in in the place of x. So <math>f(1) = 1^2 = 1*1 = 1</math>.
Every function can be drawn as a [[graph]].
==Examples==
==Examples==