Without Using a Calculator, Give the Exact Trigonometric Function Value $\frac { \sqrt { 2 } } { 2 }$

question 134

Multiple Choice

Without using a calculator, give the exact trigonometric function value with rational denominator.
-cos 60°

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

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