Find the Exact Value of the Expression $\cos ^ { - 1 } \left[ \cos \left( - \frac { 3 \pi } { 5 } \right) \right]$

question 47

Multiple Choice

Find the exact value of the expression. Do not use a calculator.
- $\cos ^ { - 1 } \left[ \cos \left( - \frac { 3 \pi } { 5 } \right) \right]$

• A) \(- \frac { 3 \pi } { 5 }\)
• B) \(\frac { 2 \pi } { 5 }\)
• C) \(\frac { 3 \pi } { 5 }\)
• D) \(- \frac { 2 \pi } { 5 }\)

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