Find the Exact Value Without Using a Calculator $\cos \left( \frac { 2 \pi } { 3 } \right)$

question 5

Multiple Choice

Find the exact value without using a calculator.
- $\cos \left( \frac { 2 \pi } { 3 } \right)$

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

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An experiment conducted in a natural setting rather than in a laboratory, allowing researchers to study economic behaviors in real-world contexts.

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A principal administrative division of certain countries or territories.

Good

A material item or service that can be bought, sold, or traded to satisfy a want or need.