I think it is not defined. It has a limes from the left (- inf) and limes from the right (+ inf) but no two-sided limes.
Edit: wolframalpha agrees but I don't know for sure
I think it is not defined. It has a limes from the left (- inf) and limes from the right (+ inf) but no two-sided limes.
Edit: wolframalpha agrees but I don't know for sure