Evaluate Without Using a Calculator, Leaving the Answers in Exact $\cos \frac { 2 \pi } { 3 }$

question 57

Multiple Choice

Evaluate without using a calculator, leaving the answers in exact form. $\cos \frac { 2 \pi } { 3 }$

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

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