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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