Evaluate the Cosine of the Angle Without Using a Calculator $30 ^ { \circ }$

question 10

Multiple Choice

Evaluate the cosine of the angle without using a calculator. $30 ^ { \circ }$

• A) \(\frac { \sqrt { 2 } } { 2 }\)
• B) \(- \frac { \sqrt { 2 } } { 2 }\)
• C) \(\frac { \sqrt { 3 } } { 2 }\)
• D) \(\frac { 1 } { 2 }\)
• E) 0

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