## Antiderivative

### The antiderivative, also known as the indefinite integral, is a fundamental concept in calculus

The antiderivative, also known as the indefinite integral, is a fundamental concept in calculus. It is the reverse process of differentiation and allows us to find a function whose derivative is equal to a given function.

Formally, given a function f(x), an antiderivative F(x) is a function whose derivative with respect to x is equal to f(x). In other words, if F'(x) = f(x), then F(x) is the antiderivative of f(x).

The symbol used to represent the antiderivative is an integral sign (∫), followed by the function to be integrated, dx representing the variable of integration. Thus, the notation for the antiderivative of a function f(x) is ∫ f(x) dx.

When finding the antiderivative of a function, we generally apply specific rules and techniques. The most common approach is to directly apply the power rule, which states that if f(x) = x^n, where n is a constant not equal to -1, then its antiderivative is F(x) = (1/(n+1))x^(n+1) + C, where C is the constant of integration.

Other commonly used techniques for finding antiderivatives include integration by substitution, integration by parts, trigonometric substitution, and partial fraction decomposition.

It is important to note that the antiderivative of a function is not unique. In fact, it has an infinite number of antiderivatives. This is due to the fact that adding a constant of integration (C) to the antiderivative does not affect its derivative.

Antiderivatives play a crucial role in various applications of calculus, such as calculating the area under a curve, solving differential equations, determining the average value of a function, and evaluating definite integrals.

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