Find the Exact Value $\cos \frac { 20 \pi } { 3 }$

question 44

Multiple Choice

Find the exact value. Do not use a calculator.
- $\cos \frac { 20 \pi } { 3 }$

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

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