/-cos(x) + cos(5*x)\ lim |------------------| x->oo| 2 | \ 4*x /
Limit((-cos(x) + cos(5*x))/((4*x^2)), x, oo, dir='-')
/-cos(x) + cos(5*x)\ lim |------------------| x->0+| 2 | \ 4*x /
-3
= -3.0
/-cos(x) + cos(5*x)\ lim |------------------| x->0-| 2 | \ 4*x /
-3
= -3.0
= -3.0