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answered 2017-07-10 19:25:14 +0100
Try this:
p=a1*a2*a3*x*f(x) + a1*a2*x^2*diff(f(x), x) + a1*a3*x^2*diff(f(x), x) + a2*a3*x^2*diff(f(x), x) p.collect(diff(f(x),x))