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Is this legal? I assumed that delta x is a constant that is approaching zero. So I brought it out. When I took the derivative, the delta x canceled out with the denominator. So I'm left with the derivative of the intergral of f(x) with respect to itself. So I'm essentially trying to find the rate of change of the sum of all the f(x) values which should equal f(x).

http://latex.codecogs.com/gif.latex...ace;f(x)=&space;d\int&space;f(x)=&space;f(x)"

This link should work ^.

http://latex.codecogs.com/gif.latex...ace;f(x)=&space;d\int&space;f(x)=&space;f(x)"

This link should work ^.

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