Use a Sum or Difference Identity to Find the Exact $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

question 47

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\cos 36 ^ { \circ } \cos 24 ^ { \circ } - \sin 36 ^ { \circ } \sin 24 ^ { \circ }$

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

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