Im working on a problem whit the follewing integral:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]I = \int|f(x+dx)dx|[/tex]

Im trying to use int by parts : [tex]t = x + dx \Rightarrow dt/dx = 1 + ddx/dx = ?[/tex], but i have no idee on what ddx/dx is? I think dx -> konstant? so ddx/dx = 1 ?

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# Integral and dx inside function

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