Medium
Find the derivative of $\frac{x^{n}-a^{n}}{x-a}$ with respect to $x$,where $a$ is a constant.
- A$\frac{(n-1)x^n - nax^{n-1} + a^n}{(x-a)^2}$
- B$\frac{(n-1)x^n + nax^{n-1} - a^n}{(x-a)^2}$
- C$\frac{(n-1)x^n - nax^{n-1} - a^n}{(x-a)^2}$
- D$\frac{(n+1)x^n - nax^{n-1} + a^n}{(x-a)^2}$
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