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Hi, besides integration by parts, does anyone know of a simple integration trick to solve the integral (wrt x) of exp(x)*f'(x)?

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- Thread starter bventer
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- #1

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- #2

Mentallic

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Could you show me how it's done by integration by parts?

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- #4

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Why not showing us what is f '(x) ?that doesn't really help me due to the complexity of the function f(x).

- #5

Mentallic

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Oh sorry, I missed the ' in f'(x) and thought you tried to find a solution to the integral of e

I can't think of another way to show it besides that technique, maybe someone else can.

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Ok, thanks for having a look MentallicOh sorry, I missed the ' in f'(x) and thought you tried to find a solution to the integral of e^{x}f(x).

I can't think of another way to show it besides that technique, maybe someone else can.

- #8

Mentallic

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To JJacquelin: I you wish, see attached jpg (apologies, but I am not well versed in Latex)

How is the y(H) function defined?

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y(H) is a quadratic: a0 + a1*H + a2*H^2How is the y(H) function defined?

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Better think to use numerical calculus, or approximations if it is a problem of physics.

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I doubt that a "clever trick" exists. By the way, the first derivative of what function ?I was hoping there might be a clever trick to exploit the fact that part of my integrand is a first derivative...

If the function is as complicated as its derivative,then there is few hope.

- #13

HallsofIvy

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Yes, there is! It is precisely the "integration by parts", letting dv= f'(x)dx that you initially did.

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