Supposed that
f(t):=((t^2+4)^(3/2)-t^3-4*t)/(2*sqrt(t^2+4))
and
g(t):=f(t+2/t^2)/f(t)
Then
limit(g(t),t,inf)
gives -2 as the answer but the correct answer is 1 as evidenced by
limit(ratsimp(g(t)),t,inf)
and
tlimit(g(t),t,inf)
fixed in limit.lisp.
in limit1, remove radlim. avoids bugs when highest-order
terms in asymptotic behavior (asymredu) cancel. gruntz
and tlimit work better for these cases.
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