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

question 3

Multiple Choice

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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A digestive enzyme that breaks down proteins in the small intestine into smaller peptides.

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A supplementary material at the end of a book, document, or presentation that provides additional details or explanations.

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The portion of the pharynx behind the nasal cavity.