Find the Exact Value of the Expression A) $- 1$ B) 1
C) 0
D)

Multiple Choice

Find the exact value of the expression.
- $\cos \left( \frac { 5 \pi } { 18 } \right) \cos \left( \frac { 2 \pi } { 9 } \right) - \sin \left( \frac { 5 \pi } { 18 } \right) \sin \left( \frac { 2 \pi } { 9 } \right)$

A) $- 1$
B) 1
C) 0
D) $\frac { \sqrt { 2 } } { 2 }$