Find the Exact Value of the Expression $\cos 285 ^ { \circ }$

question 313

Multiple Choice

Find the exact value of the expression.
- $\cos 285 ^ { \circ }$

• A) \(\frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }\)
• B) \(- \sqrt { 2 } ( \sqrt { 3 } + 1 )\)
• C) \(- \sqrt { 2 } ( \sqrt { 3 } - 1 )\)
• D) \(- \frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }\)

---

Definitions:

Euphoria

An emotion of strong enthusiasm and joy.

Heart Race

A rapid heartbeat, often perceived as a fluttering or pounding in the chest, which can be caused by excitement, stress, or physical activity.

Schachter's Two-factor Theory

A psychological theory that emotions are determined by physiological arousal and cognitive labeling of the cause of that arousal.

Different Emotions

A range of complex feelings or states that arise through circumstances, moods, or relationships with others.