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$$\tan\frac{\pi}{24}.\tan\frac{3\pi}{24}.\tan\frac{5\pi}{24}.\tan\frac{6\pi}{24}.\tan\frac{7\pi}{24}.\tan\frac{8\pi}{24}.\tan\frac{9\pi}{24}.\tan\frac{11\pi}{24}$$
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