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cot4π7cot8π7−cot8π7cot12π7−cot12π7cot4π7= ?\large \cot { \frac { 4\pi }{ 7 } } \cot { \frac { 8\pi }{ 7 } } -\cot { \frac { 8\pi }{ 7 } } \cot { \frac { 12\pi }{ 7 } } -\cot { \frac { 12\pi }{ 7 } } \cot { \frac { 4\pi }{ 7 } } = \ ? cot74πcot78π−cot78πcot712π−cot712πcot74π= ?
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