Write the Complex Number in Rectangular Form $9 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$

question 26

Multiple Choice

Write the complex number in rectangular form.
- $9 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$

• A) 9
• B) \(- 9 \mathrm { i }\)
• C) \(9 \mathrm { i }\)
• D) \(- 9\)

---

Definitions:

Disordered Behavior

Actions or patterns of actions that are considered abnormal or outside societal norms, often indicative of a psychological condition.

Identical Processes

Processes that are exactly the same in every aspect, often used in scientific experiments to ensure replicability and reliability.

Somatoform Disorder

A mental disorder characterized by physical symptoms that have no apparent physical cause, indicating that psychological factors may be involved.

Cognitive Psychologist

A professional who studies mental processes such as perception, memory, problem-solving, and decision-making.