# How do you evaluate  t a n ^ { 2} \frac { \pi } { 7} \tan ^ {

###### Question:

How do you evaluate  t a n ^ { 2} \frac { \pi } { 7} \tan ^ { 2} \frac { 2\pi } { 7} \tan ^ { 2} \frac { 3\pi } { 7}#?

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