A geometry problem by Vaibhav Prasad
Geometry
Level
3
\[\large \cot { \frac { 4\pi }{ 7 } } \cot { \frac { 8\pi }{ 7 } } -\cot { \frac { 8\pi }{ 7 } } \cot { \frac { 12\pi }{ 7 } } -\cot { \frac { 12\pi }{ 7 } } \cot { \frac { 4\pi }{ 7 } } = \ ? \]
by
Vaibhav Prasad