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Find the Exact Value of the Expression $\cos 210 ^ { \circ }$

Question 283

Multiple Choice

Find the exact value of the expression.
- $\cos 210 ^ { \circ }$

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

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