simple derivative function question

• Subject: simple derivative function question
• From: Michel Van den Bergh
• Date: Wed, 17 Jan 2007 15:15:42 +0100

How about:

f(x) := block([y], subst(x, y, diff(y^3 , y)))$
f(10);
                 300
f(x);
                3x^2

Michel

             

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