Question

Practicing on Khan Academy, and I'm not sure about this step on L'Hôpital's rule (see attached). Where did sin(sqrt(x-1)) go?

Answer 1

everything makes sense if there is no sin in the question

Answer 2

the question itself is probably
\(\Large \dfrac{1}{\ln x}-\dfrac{1}{\sqrt{x-1}}\)

Answer 3

Agreed, so probably a glitch?

Answer 4

yup...typing mistake

Answer 5

Duly submitted as a bug, thanks. :)

Answer 6

welcome ^_^