Use Sum and Difference Formulas for Cosines and Sines
- $\cos \left( 30 ^ { \circ } + 45 ^ { \circ } \right)$

question 64

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\cos \left( 30 ^ { \circ } + 45 ^ { \circ } \right)$

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

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