Find the Exact Value of the Given Expression $$\cos \left( 120 ^ { \circ } + 315 ^ { \circ } \right)$$

Find the exact value of the given expression. $$\cos \left( 120 ^ { \circ } + 315 ^ { \circ } \right)$$

A) $\frac { ( 1 - \sqrt { 3 } ) ( 2 \sqrt { 2 } ) } { 8 }$
B) $\frac { ( - 1 + \sqrt { 3 } ) ( 2 \sqrt { 2 } ) } { 8 }$
C) $\frac { ( 1 + \sqrt { 3 } ) ( 2 \sqrt { 2 } ) } { 8 }$
D) $\frac { ( - 1 - \sqrt { 3 } ) ( 2 \sqrt { 2 } ) } { 8 }$

Correct Answer:

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