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

question 314

Multiple Choice

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

• A) \(\frac { \sqrt { 3 } } { 2 }\)
• B) \(\sqrt { 3 }\)
• C) \(\frac { 1 } { 2 }\)
• D) \(\frac { 1 } { 4 }\)

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Definitions:

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