# Pf of lhopital

1. Apr 24, 2005

### ocalvino

i originally posted this in the analasys section. Since i havent been getting any results, i've figured that perhaps people feel it should be in the homework section. anyway, im trying to prove the folloting:

if lim f(x)= infinity= lim g(x)
x->infinity x->infinty

and lim f'(x)/g'(x)=infinity
x-> infinity

then lim f(x)/g(x)=inifity
x-> inifinity

To be honest, i don't know where to begin, and that's where I need your help. How do i start to prove this?

2. Apr 24, 2005