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

question 259

Multiple Choice

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) \(\frac { ( - 1 - \sqrt { 3 } ) ( 2 \sqrt { 2 } ) } { 8 }\)

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