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

Question 349

Multiple Choice

Solve the equation for exact solutions.
- 4cos⁡−1x=π4 \cos ^ { - 1 } x = \pi


A) {π4}\left\{ \frac { \pi } { 4 } \right\}

B) {12}\left\{ \frac { 1 } { 2 } \right\}

C) {22}\left\{ \frac { \sqrt { 2 } } { 2 } \right\}

D) {32}\left\{ \frac { \sqrt { 3 } } { 2 } \right\}

Correct Answer:

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