Find the Exact Value of the Expression $- \frac { \sqrt { 3 } } { 2 }$

question 140

Multiple Choice

Find the exact value of the expression.
-cos 210°

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

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