Does $\lim _ { x \rightarrow - a }$ $\frac { x - a } { x ^ { 2 } - a ^ { 2 } }$

Short Answer

Does $\lim _ { x \rightarrow - a }$ $\frac { x - a } { x ^ { 2 } - a ^ { 2 } }$ (where a ≠ 0) exist?
Enter your answer as either "yes" or "no" or "does not exist".