\( \lim _{x \rightarrow \infty} x \cos \left(\frac{\pi}{4 x}\right) \sin \left(\frac{\pi}{4 x}\r...
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1\( \lim _{x \rightarrow \infty} x \cos \left(\frac{\pi}{4 x}\right) \sin \left(\frac{\pi}{4 x}\right) \)
(A) \( \frac{\pi}{2} \)
(B) \( \frac{\pi}{4} \)
(C) 1
(D) none of these
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