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Use a Sum or Difference Identity to Find the Exact sinπ15cos4π15+cosπ15sin4π15\sin \frac { \pi } { 15 } \cos \frac { 4 \pi } { 15 } + \cos \frac { \pi } { 15 } \sin \frac { 4 \pi } { 15 }

Question 190

Multiple Choice

Use a sum or difference identity to find the exact value.
- sinπ15cos4π15+cosπ15sin4π15\sin \frac { \pi } { 15 } \cos \frac { 4 \pi } { 15 } + \cos \frac { \pi } { 15 } \sin \frac { 4 \pi } { 15 }


A) 32\frac { \sqrt { 3 } } { 2 }
B) 1
C) 22\frac { \sqrt { 2 } } { 2 }
D) 12\frac { 1 } { 2 }

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