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Homework Statement
[tex] \lim_{t \to \infty} \frac {1-\frac{t}{(t-1)}}{1-\sqrt{\frac{t}{(t-1)}}} [/tex]
Homework Equations
The Attempt at a Solution
I am pretty sure that everything I did here was legal, I just wanted to check. I got the right answer, so yeah, here's what I did:
[tex] \lim_{t \to \infty} \frac {1-\frac{t}{(t-1)}}{1-\sqrt{\frac{t}{(t-1)}}} [/tex]
derivative turns out to be:
[tex] \lim_{t \to \infty} \frac{\frac{1}{(t-1)^{2}}}{\frac{1}{2}(\frac{1}{(t-1)^{2}})(\frac{t}{t-1})^{-1/2}} [/tex]
and after the obvious term cancels we have:
[tex] \lim_{t \to \infty} \frac {1}{\frac{1}{2} (\frac{t}{t-1})^{-1/2}} [/tex]
and since it is a reciprocal of a reciprocal this is the same thing:
[tex] \lim_{t \to \infty} 2(\frac{t}{t-1})^{1/2} [/tex]
then with the limit applied:
[tex] \lim_{t \to \infty} 2(\frac{t}{t-1})^{1/2} = 2[/tex]
the step with the flipping of the reciprocals is really all I need check, I am fairly certain everything else is good.
thanks!