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Mathematica 9 behavior with derivative of a sum
In: D[Sum[Sin[x],x],x] D[Sum[f[x],x],x] Out: 1/2 Cos[1/2 (-1 - Pi + 2 x)] Csc[1/2] 0
Function f is undefined, but Mathematica 9 counts it as constant? ...
Dec 19 '12 at 9:26
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