Solve the Equation for Exact Solutions $4 \cos ^ { - 1 } x = \pi$

question 349

Multiple Choice

Solve the equation for exact solutions.
- $4 \cos ^ { - 1 } x = \pi$

• A) \(\left\{ \frac { \pi } { 4 } \right\}\)
• B) \(\left\{ \frac { 1 } { 2 } \right\}\)
• C) \(\left\{ \frac { \sqrt { 2 } } { 2 } \right\}\)
• D) \(\left\{ \frac { \sqrt { 3 } } { 2 } \right\}\)

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