\( \lim _{n \rightarrow \infty} n \cos \left(\frac{\pi}{4 n}\right)...

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\( \lim _{n \rightarrow \infty} n \cos \left(\frac{\pi}{4 n}\right) \sin \left(\frac{\pi}{4 n}\right) \) is equal to:
(1) \( \frac{\pi^{*}}{3} \)
(2) \( \frac{\pi}{4} \)
P
W
(3) \( \frac{\pi}{6} \)
(4) none of these
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