Find the Exact Value of the Expression A) $\frac { 1 } { 2 }$

question 51

Multiple Choice

Find the exact value of the expression.
- $\cos \left( \frac { 7 \pi } { 12 } \right) \cos \left( \frac { 5 \pi } { 12 } \right) + \sin \left( \frac { 7 \pi } { 12 } \right) \sin \left( \frac { 5 \pi } { 12 } \right)$

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

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