a \text { if } \lim _ { x \rightarrow - a } \frac { x ^ { 3 } - a ^ { – InterviewSolution

1.	a \text { if } \lim _ { x \rightarrow - a } \frac { x ^ { 3 } - a ^ { 3 } } { x - a } = \lim _ { x \rightarrow 1 } \frac { x ^ { 4 } - 1 } { x - 1 }
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