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Find the Exact Value of the Expression cos⁡20∘cos⁡40∘−sin⁡20∘sin⁡40∘\cos 20 ^ { \circ } \cos 40 ^ { \circ } - \sin 20 ^ { \circ } \sin 40 ^ { \circ }

Question 314

Multiple Choice

Find the exact value of the expression.
- cos⁡20∘cos⁡40∘−sin⁡20∘sin⁡40∘\cos 20 ^ { \circ } \cos 40 ^ { \circ } - \sin 20 ^ { \circ } \sin 40 ^ { \circ }


A) 32\frac { \sqrt { 3 } } { 2 }
B) 3\sqrt { 3 }
C) 12\frac { 1 } { 2 }
D) 14\frac { 1 } { 4 }

Correct Answer:

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