Resolve \( \frac{1}{x^{2}-(a+b) x+a b} \) into partial fractions. (W) (a) \( \frac{1}{a+b}\left[...

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Resolve \( \frac{1}{x^{2}-(a+b) x+a b} \) into partial fractions.
(W)
(a) \( \frac{1}{a+b}\left[\frac{1}{x-a}+\frac{1}{x-b}\right] \)
(b) \( \frac{1}{a+b}\left[\frac{1}{x-a}-\frac{1}{x-b}\right] \)
(c) \( \frac{1}{a-b}\left[\frac{1}{x-a}+\frac{1}{x-b}\right] \)
(d) \( \frac{1}{a-b}\left[\frac{1}{x-a}-\frac{1}{x-b}\right] \)
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