The fundamental theorem of calculus
is a theorem that links the concept of differentiating a function with
the concept of integrating a function.
The first part of the theorem, sometimes called
the first fundamental theorem of calculus,
states that one of the antiderivatives (also called indefinite integral),
say F, of some function f may be obtained as the integral of f with
a variable bound of integration.
This implies the existence of antiderivatives for continuous functions.[1]
Conversely, the second part of the theorem, sometimes called
the second fundamental theorem of calculus,
states that the integral of a function f over some interval can be computed by
using any one, say F, of its infinitely many antiderivatives.
This part of the theorem has key practical applications,
because explicitly finding the antiderivative of a function by
symbolic integration avoids numerical integration to compute integrals.
This provides generally a better numerical accuracy.
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