Use Identities to Find the Indicated Value for Each Angle $$\cos \frac { 7 \pi } { 12 } \cos \frac { 5 \pi } { 12 } + \sin \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 }$$

question 84

Multiple Choice

Use identities to find the indicated value for each angle measure.
- $$\cos \frac { 7 \pi } { 12 } \cos \frac { 5 \pi } { 12 } + \sin \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 }$$

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

---

Definitions:

Conversion Costs

Costs incurred in the process of converting raw materials into finished products, typically including direct labor and manufacturing overhead.

Assembly Labor's Wages

The earnings provided to employees who work specifically in assembling parts or products in a manufacturing process.

Raw Lumber

Unprocessed wood used as a base material in construction and manufacturing, typically sold in bulk or by the board foot.

Materials Cost Per Unit

The total cost of materials required to produce a single unit of product, including direct and sometimes indirect materials.