Solve the Equation in the Interval $$\left[ 0 ^ { \circ } , 360 ^ { \circ } \right)$$

question 172

Multiple Choice

Solve the equation in the interval $$\left[ 0 ^ { \circ } , 360 ^ { \circ } \right)$$ ) . Give solutions to the nearest tenth, if necessary.
- $2 \cos ^ { 3 } \theta = \cos \theta$

• A) \(\left\{ 90 ^ { \circ } , 270 ^ { \circ } \right\}\)
• B) \(\left\{ 45 ^ { \circ } , 135 ^ { \circ } , 225 ^ { \circ } , 315 ^ { \circ } \right\}\)
• C) \(\varnothing\)
• D) \(\left\{ 45 ^ { \circ } , 90 ^ { \circ } , 135 ^ { \circ } , 225 ^ { \circ } , 270 ^ { \circ } , 315 ^ { \circ } \right\}\)

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