Find all solutions to the equation.
-$$\cos ^ { 2 } x + 2 \cos x + 1 = 0$$
A) $\left\{ \frac { \pi } { 4 } + 2 \mathrm { n } \pi , \frac { 3 \pi } { 4 } + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \right\}$
B) $\left\{ \frac { 3 \pi } { 2 } + 2 n \pi \mid n = 0 , \pm 1 , \pm 2 , \ldots . \right\}$
C) $\{ \pi + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \}$
D) $\{ \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \}$

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The Answer of Find all solutions to the equation.
-$$\cos ^ { 2 } x + 2 \cos x + 1 = 0$$
A) $\left\{ \frac { \pi } { 4 } + 2 \mathrm { n } \pi , \frac { 3 \pi } { 4 } + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \right\}$
B) $\left\{ \frac { 3 \pi } { 2 } + 2 n \pi \mid n = 0 , \pm 1 , \pm 2 , \ldots . \right\}$
C) $\{ \pi + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \}$
D) $\{ \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \}$

Find All Solutions to the Equation cos⁡2x+2cos⁡x+1=0\cos ^ { 2 } x + 2 \cos x + 1 = 0cos2x+2cosx+1=0

Find All Solutions to the Equation $\cos ^ { 2 } x + 2 \cos x + 1 = 0$