I recently started to learn Python and I have stumbled over an issue since quite a few days. How to evaluate a function at let say x=2. example h=diff(sin(x)) print(h(2.)) =cos(x) or print (N(h(x),2.) =cos(x) or print (h(x).evalf(2.)) =cos (x) but never the value of cos(2.) Could you please help me thanks Patrice
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