This simple minded approach seems to work for me: sage: a(x)=2*x sage: b(x)=a(x)^2 sage: g(x)=diff(b(x),x) sage: g(2) 16
-Alasdair On Jan 21, 2:14 am, Stochastix <laurent.decreusef...@gmail.com> wrote: > I have the following problem : I have two nested functions > > a=lambda x: 2*x > b=lambda x: a(x)^2 > > Everything goes well as long as I want to compute the derivative of b > but how can I evaluate this derivative at x=2. > I tried > > g=lambda x: diff(b(x),x) > g(x) returns 8*x as expected > > but g(2)=0. > > In other words, how can we substitute x=2 to the expression 8*x ? > I guess this is somewhere in the docs but I didn't find where.
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