In which limits below can we use L'Hospital's Rule?
1) lim_(x→ infty)(2x²+3x+6)/(x²+9x-9)
2) lim_(x→0)(1-eˣ)/(sin(2x))
3) lim_(x→ infty)(lnx)/( √(x))
4) lim_(x→0)(2x)/(cotx)