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tan2π16+tan23π16+tan25π16+tan27π16= ? \large \tan^{2} \frac{\pi}{16} + \tan^{2} \frac{3\pi}{16} + \tan^{2} \frac{5\pi}{16} + \tan^{2} \frac{7\pi}{16} = \, ? tan216π+tan2163π+tan2165π+tan2167π=?
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