Find the Exact Value by Using a Half-Angle Identity $\cos \frac { 5 \pi } { 12 }$

question 94

Multiple Choice

Find the exact value by using a half-angle identity.
- $\cos \frac { 5 \pi } { 12 }$

• 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) \(- \frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }\)

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Definitions:

Independent Variables

Elements within a model or an experiment that are intentionally modified to gauge their influence on variables that depend on them.

Units

Basic quantities or entities used to express measurements, counts, or in some contexts, the objects of study.

Regression Model

A mathematical model used to predict or explain the relationship between a dependent variable and one or more independent variables.

Unit Price

The cost or price of a single unit of a product, service, or measured quantity, allowing for direct cost comparison.