What is the rule for multiplying in integrals?

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What is the rule for finding the integral of the product of two functions?

Like this: ∫f(x)g(x)dx

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1 Answer

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You can use integration by parts.

$\displaystyle \int f(x)\ g'(x) \, dx = f(x) g(x) - \displaystyle \int f'(x)\ g(x) \, dx$

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