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?
Hello, viet!
Where is your difficulty?
. . . .cosh x -1
lim . ----------- . . . . This goes to 0/0
x→0 . . .x²
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