Use Identities to Fill in the Blank with the Appropriate $$\cos \frac { \pi } { 11 } - \cos \frac { \pi } { 2 }$$

Use identities to fill in the blank with the appropriate trigonometric function name.
- $$\cos \frac { \pi } { 11 } - \cos \frac { \pi } { 2 }$$

A) $- 2 \cos \frac { 13 \pi } { 44 } \cos \left( \frac { - 9 \pi } { 44 } \right)$
B) $- 2 \sin \frac { 13 \pi } { 44 } \sin \left( \frac { - 9 \pi } { 44 } \right)$
C) $- 2 \sin \frac { 13 \pi } { 44 } \cos \left( \frac { - 9 \pi } { 44 } \right)$
D) $- 2 \cos \frac { 13 \pi } { 44 } \sin \left( \frac { - 9 \pi } { 44 } \right)$

Correct Answer:

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