1. ## l'Hopital's Rule

limit cosh x -1
x -> 0 ----------
(x^2)

on this problem i did l'hopital twice and got -inf.
answer is wrong, can someone explain?

2. Hello, viet!

. . . .cosh x -1
lim . ----------- . . . . This goes to 0/0
x→0 . . .

Apply L'Hopital:

. . . .sinh x
lim . -------- . . . . This goes to 0/0
x→0 . .2x

Apply L'Hopital again:

. . . .cosh x
lim . -------- . . . . This goes to ½
x→0 . . 2