\( \lim _{x \rightarrow a} \frac{x}{x-a} \cdot \int_{a}^{x} f(x) d ... VIDEO
\( \lim _{x \rightarrow a} \frac{x}{x-a} \cdot \int_{a}^{x} f(x) d x \) is equal to
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(a) \( f(a) \)
(b) af(a)
(c) 0
(d) none of these
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