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Without Using a Calculator, Give the Exact Trigonometric Function Value cos⁡60∘\cos 60 ^ { \circ }

Question 155

Multiple Choice

Without using a calculator, give the exact trigonometric function value with rational denominator.
- cos⁡60∘\cos 60 ^ { \circ }


A) 12\frac { 1 } { 2 }
B) 22\frac { \sqrt { 2 } } { 2 }
C) 3\sqrt { 3 }
D) 32\frac { \sqrt { 3 } } { 2 }

Correct Answer:

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