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Find the Exact Value of the Expression $\cos ^ { - 1 } \left[ \cos \left( \frac { \pi } { 10 } \right) \right]$

Question 247

Question 247

Multiple Choice

Find the exact value of the expression. Do not use a calculator.
- $\cos ^ { - 1 } \left[ \cos \left( \frac { \pi } { 10 } \right) \right]$

A) $\frac { \pi } { 10 }$
B) $10 \pi$
C) $- 10 \pi$
D) $- \frac { \pi } { 10 }$

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