Use Sum and Difference Formulas for Cosines and Sines
- $\cos 285 ^ { \circ }$

question 9

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\cos 285 ^ { \circ }$

• A) \(\frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }\)
• B) \(- \frac { \sqrt { 2 } ( \sqrt { 3 } - 1 ) } { 4 }\)
• C) \(- \sqrt { 2 } ( \sqrt { 3 } + 1 )\)
• D) \(- \sqrt { 2 } ( \sqrt { 3 } - 1 )\) Find the exact value of the expression.

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