I am stucked after the last line. It seems there is no way to make the equality hold. Thank you very much.
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You missed some terms : for example we have .
I did have one more question. I deduced that from the fundamental theorem. d/dx int (a to x) f(t)dt = f(x) with no - f(a) entering. While it appears here ? Thanks a lot.
Indeed it doesn't appear in the first term, but it appear in the others because it's not the same differentiation (here it is differentiation under the symbol ).
Thanks a lot I got it now.
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