Use Identities to Find the Exact Value $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

question 474

Multiple Choice

Use Identities to find the exact value.
- $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

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

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