# The Antiderivative (Indefinite Integral)

*If:*

*Then:*

Notice something important here: taking the derivative of f(x) may precisely give you g(x), but taking the antiderivative of g(x) does not necessarily give you f(x) in its original form. Example:

Note that the constant c is unknown! The original function f(x) could have been 3x^{2} + 5, 3x^{2} + 10, 3x^{2} + *anything*, and the derivative of f(x) would have still been 6x. Determining the antiderivative of a function, then, is a bit less certain than determining the derivative of a function.

**Lessons In Electric Circuits** copyright (C) 2000-2020 Tony R. Kuphaldt, under the terms and conditions of the *CC BY License**.*

**Lessons In Electric Circuits**

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Revised July 25, 2007

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