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

Question

Quizplus · Accepted Answer

To solve $4 \cos ^ { - 1 } x = \pi$, divide both sides by 4 to get $\cos ^ { - 1 } x = \frac{\pi}{4}$. The cosine of $\frac{\pi}{4}$ is $\frac{\sqrt{2}}{2}$, so $x = \frac{\sqrt{2}}{2}$.

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

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