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Question about sum and diff

Why this code : f(x)=sum(diff(sin(x),x,n),n,1,10) f(x) does not work?

Question about sum and diff

Why this code : :

f(x)=sum(diff(sin(x),x,n),n,1,10)
f(x)f(x)

does not work?

Question about sum and diff

Why this code :

f(x)=sum(diff(sin(x),x,n),n,1,10)
f(x)

does not work?