Find the exact value of the expression.
-$\cos \left[ \tan ^ { - 1 } \left( \frac { \sqrt { 3 } } { 3 } \right) \right]$
A) $\frac { \pi } { 3 }$
B) $\frac { 1 } { 2 }$
C) $\frac { \sqrt { 3 } } { 3 }$
D) $\frac { \sqrt { 3 } } { 2 }$

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The Answer of Find the exact value of the expression.
-$\cos \left[ \tan ^ { - 1 } \left( \frac { \sqrt { 3 } } { 3 } \right) \right]$
A) $\frac { \pi } { 3 }$
B) $\frac { 1 } { 2 }$
C) $\frac { \sqrt { 3 } } { 3 }$
D) $\frac { \sqrt { 3 } } { 2 }$

Find the Exact Value of the Expression cos⁡[tan⁡−1(33)]\cos \left[ \tan ^ { - 1 } \left( \frac { \sqrt { 3 } } { 3 } \right) \right]cos[tan−1(33​​)]

Find the Exact Value of the Expression $\cos \left[ \tan ^ { - 1 } \left( \frac { \sqrt { 3 } } { 3 } \right) \right]$