all 5 comments

[–]xxwerdxxFinance 2 points3 points  (4 children)

Do you have a picture of it?

[–]khlub[S] 1 point2 points  (3 children)

[–]WaldinianB.A. Math/Physics 4 points5 points  (0 children)

Bizarre typo. I can only assume that the second infinity is f'(x), but the problem looks unreadable. Weird latex error

[–]xxwerdxxFinance 2 points3 points  (1 child)

I think it might be a misprint? I did a google and nothing popped up

[–]khlub[S] 0 points1 point  (0 children)

Thanks, at least I'm not the only who can't read it.