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14−sec22π7+14−sec24π7+14−sec26π7= ?\large \dfrac{1}{4-\sec^{2}\frac{2\pi}{7}} + \dfrac{1}{4-\sec^{2}\frac{4\pi}{7}} + \dfrac{1}{4-\sec^{2}\frac{6\pi}{7}} = \ ?4−sec272π1+4−sec274π1+4−sec276π1= ?
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