Use a sum or difference identity to find the exact value.
-$$\sin \frac { \pi } { 15 } \cos \frac { 4 \pi } { 15 } + \cos \frac { \pi } { 15 } \sin \frac { 4 \pi } { 15 }$$
A) 1
B) $\frac { \sqrt { 3 } } { 2 }$
C) $\frac { \sqrt { 2 } } { 2 }$
D) $\frac { 1 } { 2 }$

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The Answer of Use a sum or difference identity to find the exact value.
-$$\sin \frac { \pi } { 15 } \cos \frac { 4 \pi } { 15 } + \cos \frac { \pi } { 15 } \sin \frac { 4 \pi } { 15 }$$
A) 1
B) $\frac { \sqrt { 3 } } { 2 }$
C) $\frac { \sqrt { 2 } } { 2 }$
D) $\frac { 1 } { 2 }$

Use a Sum or Difference Identity to Find the Exact sin⁡π15cos⁡4π15+cos⁡π15sin⁡4π15\sin \frac { \pi } { 15 } \cos \frac { 4 \pi } { 15 } + \cos \frac { \pi } { 15 } \sin \frac { 4 \pi } { 15 }sin15π​cos154π​+cos15π​sin154π​

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