[Maxima-discuss] How do I tell limit that a function f is continuous?

[Eduardo O. <edu...@gm...>]

Hi list,

How do I tell "limit" that a function f is continuous, or smooth?
I was hoping that the first limit below would yield f_x(42), but it
doesn't without assumptions like continuity and differentiability...

  gradef(f(x), f_x(x))$
  limit((f(42+eps)-f(42))/eps, eps,0);
  limit((sin(42+eps)-sin(42))/eps, eps,0);

Thanks in advance!
  Eduardo Ochs
  http://anggtwu.net/eev-qdraw.html  <- (work in progress)