Simple calculus question

Quite simply speaking, you can define the answer in terms of approach, or L'Hospital's rule. For general purposes and derivatives/integrals, if all approaches do not equal each other, the particular point in question is undefined. For example, tan(90 degrees) is undefined.

@ Morgana, I've only seen DNE in L'Hospital shyts, and nowhere else o.O

Uh. What? I may be missing the point of your post, but L'Hopital's rule isn't applicable in this scenario. It's DNE because of what shouri posted.