/log(cos(x))\ lim |-----------| x->oo| 2 | \ x /
Limit(log(cos(x))/x^2, x, oo, dir='-')
/log(cos(x))\ lim |-----------| x->0+| 2 | \ x /
-1/2
= -0.5
/log(cos(x))\ lim |-----------| x->0-| 2 | \ x /
0
-0.5