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3−tan2(π7)1−tan2(π7)÷cos(π7)= ? \large \dfrac{3 - \tan^2\left( \dfrac\pi7 \right)}{1 - \tan^2\left( \dfrac\pi7 \right)} \div \cos\left( \dfrac\pi7 \right) = \, ? 1−tan2(7π)3−tan2(7π)÷cos(7π)=?
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