# Does anyone know of any good sites for integration and integration by parts?

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Hi, I'm learning Calculus and I'm doing ok so far, but Integration by parts is a little tough.

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Basically you use it when you've got an integral of a product of two things, one of which is easy to integrate but the other of which is not.

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Integration by parts is just the reverse of the chain rule:

d(u*v) = d(u)*v + u*d(v)

integrated and re-arranged:

I(u * d(v)) = u*v - I(d(u) * v)

That's how I remember it. As for implementing it, fractoid is right...find:

(the tough to integrate part)*(the easy to integrate part)

and use:

d(v) = (the easy to integrate part)

sorry for my use of d() to signify d()/dx...I know real mathematicians are rolling in their graves (at least the dead ones who frequert GameDev [8^)

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Lets keep this discussion to be references to external websites, not a tutorial. There are websites dedicated to math education, and this is NOT one of them!

Try the Forum FAQ, which points to some math education sites.

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