Find the Exact Value by Using a Half-Angle Identity $$\sin \frac { \pi } { 11 } + \sin \frac { \pi } { 4 }$$

question 321

Multiple Choice

Find the exact value by using a half-angle identity.
- $$\sin \frac { \pi } { 11 } + \sin \frac { \pi } { 4 }$$

• A) \(2 \cos \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }\)
• B) \(2 \cos \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }\)
• C) \(2 \sin \frac { 15 \pi } { 88 } \sin \frac { 7 \pi } { 88 }\)
• D) \(2 \sin \frac { 15 \pi } { 88 } \cos \frac { 7 \pi } { 88 }\)

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