The solution set of the equation $\cos 2 x = \cos x + 2$ on $[ 0,2 \pi ]$ is

A) $\left\{ \frac { 2 \pi } { 3 } \right\}$
B) $\left\{ \frac { 4 \pi } { 3 } \right\}$
C) $\left\{ \frac { \pi } { 3 } , \frac { 4 \pi } { 3 } \right\}$
D) $\{ \pi \}$
E) $\varnothing$

Question

The solution set of the equation $\cos 2 x = \cos x + 2$ on $[ 0,2 \pi ]$ is

A) $\left\{ \frac { 2 \pi } { 3 } \right\}$
B) $\left\{ \frac { 4 \pi } { 3 } \right\}$
C) $\left\{ \frac { \pi } { 3 } , \frac { 4 \pi } { 3 } \right\}$
D) $\{ \pi \}$
E) $\varnothing$

Quizplus · Accepted Answer

The Answer of The solution set of the equation $\cos 2 x = \cos x + 2$ on $[ 0,2 \pi ]$ is

A) $\left\{ \frac { 2 \pi } { 3 } \right\}$
B) $\left\{ \frac { 4 \pi } { 3 } \right\}$
C) $\left\{ \frac { \pi } { 3 } , \frac { 4 \pi } { 3 } \right\}$
D) $\{ \pi \}$
E) $\varnothing$

The Solution Set of the Equation cos⁡2x=cos⁡x+2\cos 2 x = \cos x + 2cos2x=cosx+2

The Solution Set of the Equation $\cos 2 x = \cos x + 2$