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Question Number 100436 by Dwaipayan Shikari last updated on 26/Jun/20

$$\alpha =\frac{2\pi }{7}$$$$\mathrm{Find}\mathrm{the}\mathrm{value}\mathrm{of}$$$$\tan \alpha \tan 2\alpha +\tan 2\alpha \tan 4\alpha +\tan \alpha \tan 4\alpha$$

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