Leibniz integral rule "proof"?

[quasar987]

Does anyone know how to get the Leibniz integral rule (a.k.a. differentiation under the integral sign)? I'm clueless.

It can be found here

http://mathworld.wolfram.com/LeibnizIntegralRule.html

[Ethereal]

Check this thread out:

Differentiation of an integral (http://www.physicsforums.com/showthread.php?t=36033)

[quasar987]

Very nice! Thanks Ethereal.