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

question 225

Multiple Choice

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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