Find the exact value of the expression, if it is defined. $\cos \left( \tan ^ { - 1 } ( - \sqrt { 3 } ) \right]$
A) $- 1 / 2$
B) $\sqrt { 3 } / 3$
C) $\sqrt { 3 }$
D) $\sqrt { 3 } / 2$
E) $1 / 2$

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The Answer of Find the exact value of the expression, if it is defined. $\cos \left( \tan ^ { - 1 } ( - \sqrt { 3 } ) \right]$
A) $- 1 / 2$
B) $\sqrt { 3 } / 3$
C) $\sqrt { 3 }$
D) $\sqrt { 3 } / 2$
E) $1 / 2$

Find the Exact Value of the Expression, If It Is cos⁡(tan⁡−1(−3)]\cos \left( \tan ^ { - 1 } ( - \sqrt { 3 } ) \right]cos(tan−1(−3​)]

Find the Exact Value of the Expression, If It Is $\cos \left( \tan ^ { - 1 } ( - \sqrt { 3 } ) \right]$