The value of \( \sum_{n=1}^{10}\left(\sin \frac{2 n \pi}{11}-\cos \frac{2 n \pi}{11}\right) \) i...

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The value of \( \sum_{n=1}^{10}\left(\sin \frac{2 n \pi}{11}-\cos \frac{2 n \pi}{11}\right) \) is equal to
(a) 2
(b) 1
(c) 0
(d) \( -1 \)
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