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Question: Don't understand the results of a differentiation

Question:Don't understand the results of a differentiation

screeno 5 Maple
derivative
November 15 2013
1

I assign a function like so: f:=x->0.2*x^2*(x-3)^3

Then using d/dx in the expression palette I differentiate: d/dx f(x)

Get the following: 0.6x^2 (x-3)^2 D(x^2)(x-3)

What is the "D" in the last expression? What hasn't the whole differentiation been completed?
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