$$\cos \left( - 690 ^ { \circ } \right)$$ A) $\frac { \sqrt { 2 } } { 2 }$

question 207

Multiple Choice

$$\cos \left( - 690 ^ { \circ } \right)$$

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

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