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In calculus, and more generally in mathematical analysis, integration by parts or partial integration is a process that finds the integral of a product of functions in terms of the integral of the product of their derivative and antiderivative. It is frequently used to transform the antiderivative of a product of functions into an antiderivative for which a solution can be more easily found. The rule can be thought of as an integral version of the product rule of differentiation; it is indeed derived using the product rule.
The integration by parts formula states:∫𝑎𝑏𝑢(𝑥)𝑣′(𝑥)𝑑𝑥=[𝑢(𝑥)𝑣(𝑥)]𝑎𝑏−∫𝑎𝑏𝑢′(𝑥)𝑣(𝑥)𝑑𝑥=𝑢(𝑏)𝑣(𝑏)−𝑢(𝑎)𝑣(𝑎)−∫𝑎𝑏𝑢′(𝑥)𝑣(𝑥)𝑑𝑥.
It is important to note that the former expression is written as a definite integral and the latter is written as an indefinite integral. Applying the appropriate limits to the latter expression should yield the former, but the latter is not necessarily equivalent to the former.
Mathematician Brook Taylor discovered integration by parts, first publishing the idea in 1715.[1][2] More general formulations of integration by parts exist for the Riemann–Stieltjes and Lebesgue–Stieltjes integrals. The discrete analogue for sequences is called summation by parts.
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