Use the Half-Angle Formulas to Find the Exact Value of the Trigonometric

question 289

Multiple Choice

Use the Half-angle Formulas to find the exact value of the trigonometric function.
- $\cos 165 ^ { \circ }$

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

---

Definitions:

Fluid Connective Tissue

This refers to body fluids like blood and lymph that connect various systems by carrying nutrients, gases, and waste products.

Klinefelter's Syndrome

A genetic condition in males characterized by an extra X chromosome, leading to various physical and reproductive issues.

Breast Enlargement

The increase in size, shape, or fullness of the breasts, which can occur naturally, through hormonal changes, or be achieved surgically.

Tissues

Groups of similar cells that perform specific functions within an organism, fundamental components of biology in structure and function.