Question: How to eval Diff(x,x)?

I find eval(Diff(x,x)) still is Diff(x,x)

how to make become 1

or how to evaluate Capital Diff ?


and I find sum(diff(x^k,x)/k! , k=1..n)

return exp(x) *gamma(n,x)/gamma(n)

why not exp(x)?


and diff( m(x+ diff(...) ...) / diff without m(x) , why return 0

i still have not define m(x)


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