Use Identities to Find the Indicated Value for Each Angle $2 \cos ^ { 2 } 22.5 ^ { \circ } - 1$

question 121

Multiple Choice

Use identities to find the indicated value for each angle measure.
- $2 \cos ^ { 2 } 22.5 ^ { \circ } - 1$

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

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Definitions:

Styrene

A colorless liquid that is used in the manufacture of polystyrene plastics, rubber, and resins.

Branching

The deviation from a straight chain in a molecule by having side chains or branches in its structure.

Poly(vinyl Chloride)

A synthetic plastic polymer commonly known as PVC, used in a wide range of products due to its durability and flexibility.

Monomer Structure

The basic building block of a polymer, representing the simplest repeat unit that forms a larger chain through polymerization.