Find the exact value of the expression.
-$\tan ^ { - 1 } \left[ \tan \left( \frac { 6 \pi } { 7 } \right) \right]$
A) $- \frac { 6 \pi } { 7 }$
B) $\frac { \pi } { 7 }$
C) $\frac { 6 \pi } { 7 }$
D) $- \frac { \pi } { 7 }$

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The Answer of Find the exact value of the expression.
-$\tan ^ { - 1 } \left[ \tan \left( \frac { 6 \pi } { 7 } \right) \right]$
A) $- \frac { 6 \pi } { 7 }$
B) $\frac { \pi } { 7 }$
C) $\frac { 6 \pi } { 7 }$
D) $- \frac { \pi } { 7 }$

Find the Exact Value of the Expression tan⁡−1[tan⁡(6π7)]\tan ^ { - 1 } \left[ \tan \left( \frac { 6 \pi } { 7 } \right) \right]tan−1[tan(76π​)]

Find the Exact Value of the Expression $\tan ^ { - 1 } \left[ \tan \left( \frac { 6 \pi } { 7 } \right) \right]$