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sec2(π9)+sec2(2π9)+sec2(4π9)= ?\large \sec^{2} \left ( \dfrac{\pi}{9} \right ) + \sec^{2} \left (\dfrac{2 \pi}{9}\right) + \sec^{2} \left (\dfrac{4 \pi}{9}\right) = \, ? sec2(9π)+sec2(92π)+sec2(94π)=?
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sec2(9π)+sec2(92π)+sec2(94π)=?
