Solve the equation for exact solutions.
-$4 \cos ^ { - 1 } x = \pi$
A) $\left\{ \frac { \pi } { 4 } \right\}$
B) $\left\{ \frac { 1 } { 2 } \right\}$
C) $\left\{ \frac { \sqrt { 3 } } { 2 } \right\}$
D) $\left\{ \frac { \sqrt { 2 } } { 2 } \right\}$

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The Answer of Solve the equation for exact solutions.
-$4 \cos ^ { - 1 } x = \pi$
A) $\left\{ \frac { \pi } { 4 } \right\}$
B) $\left\{ \frac { 1 } { 2 } \right\}$
C) $\left\{ \frac { \sqrt { 3 } } { 2 } \right\}$
D) $\left\{ \frac { \sqrt { 2 } } { 2 } \right\}$

Solve the Equation for Exact Solutions 4cos⁡−1x=π4 \cos ^ { - 1 } x = \pi4cos−1x=π

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