/cos(2*x)\ lim |--------| x->oo\ x /
Limit(cos(2*x)/x, x, oo, dir='-')
/cos(2*x)\ lim |--------| x->0+\ x /
oo
= 150.986755160519
/cos(2*x)\ lim |--------| x->0-\ x /
-oo
= -150.986755160519
0
150.986755160519