The value of \( \lim _{x \rightarrow a} \frac{x \sin a-a \sin x}{x-a} \) is (a) a \( \sin a-\cos...

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The value of \( \lim _{x \rightarrow a} \frac{x \sin a-a \sin x}{x-a} \) is
(a) a \( \sin a-\cos a \)
(b) \( \sin a-a \cos a \)
(c) \( \cos a+a \sin a \)
(d) \( \sin a+a \cos a \)
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