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## Leibniz integral rule "proof"?

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

 Check this thread out: Differentiation of an integral
 Recognitions: Gold Member Homework Help Science Advisor Very nice! Thanks Ethereal.