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Find the Exact Value of the Expression cos⁡285∘\cos 285 ^ { \circ }

Question 313

Multiple Choice

Find the exact value of the expression.
- cos⁡285∘\cos 285 ^ { \circ }


A) 2(3−1) 4\frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }
B) −2(3+1) - \sqrt { 2 } ( \sqrt { 3 } + 1 )
C) −2(3−1) - \sqrt { 2 } ( \sqrt { 3 } - 1 )
D) −2(3−1) 4- \frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }

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