- #1
GwtBc
- 74
- 6
Homework Statement
find the limit of arccoshx - ln x as x -> infinity
Homework Equations
##arccosh x = \ln (x +\sqrt[]{x^2-1} )##
The Attempt at a Solution
## \lim_{x \to \infty }(\ln (x + \sqrt{x^2-1} ) - \ln (x)) = \lim_{x \to \infty} \ln (\frac{x+\sqrt{x^2-1}}{x})
\ln (1 + \lim_{x \to \infty}\frac{\sqrt{x^2-1}}{x})##
I can see that the limit of the second part is also going to one, but I can't manipulate the expression to show this.