as and as hence, there's no reason to differentiate again since there's no indeterminate form.
Find the error in the following incorrect application of L'Hopital's rule.
Therefore, the lim x--> 0 = .
I'm not sure what the problem is. My guess is that it has something to do with ignoring the 0 (that came from the derivative of 1) on the numerator of the 2nd derivative.
I know the value of 0 plugged in is correct. There didn't appear any faulty differentiation.
Another thought is that I should use a trig rule.
1 - cos (x) looks like it should be replaced by something.