HP Prime undef for Limes. Maybe a Bug?

[roadrunner]

Check out this version:

Code:

#cas
limit_exact(a,b,c,d):=
BEGIN
 local x;
 assume(x,symbol);
 limit(subst(a,b=x),x,exact(c),d);
END;
#end

Now,

f(x) := ((5-2x) + sin(5-2x)) / (2x^2 - 3x - 5)
limit_exact(f(x), x, 2.5, 0) returns -4/7
limit_exact(f(t), t, 2.5, 0) also returns -4/7

It should work with any independent variable.

   

-road