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Entering constant placeholders

I can't seem to make this work.  When I enter the following, I get these

SetAttributes[a,b,c, Constant]

Syntax::tsntxi: "SetAttributes a,constant" is incomplete; more input is

d(ax^3 + bx^2 + cx + d)/dx

The answer should be 3ax^2+2bx+c .  I can't figure out how to tell
mathematica that a,b, & c are constants.


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