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Let's say I want to do this integral:

[tex]\int_{}^{}f(x)g(x)\,dx[/tex]

We use this formula

[tex]\int f(x)g'(x)\, dx=f(x)g(x)-\int f'(x)g(x)\, dx[/tex]

I don't understand the utility of this equation, since we want to find [tex]\int_{}^{}f(x)g(x)\,dx[/tex] and not [tex]\int f(x)g'(x)\, dx[/tex]

Please help,

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# Homework Help: I don't understand integration by parts

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