Use the Formula for the Cosine of the Difference of Two

question 214

Multiple Choice

Use the Formula for the Cosine of the Difference of Two Angles
- $\cos \left( 160 ^ { \circ } \right) \cos \left( 40 ^ { \circ } \right) + \sin \left( 160 ^ { \circ } \right) \sin \left( 40 ^ { \circ } \right)$

• A) \(\cos \left( 120 ^ { \circ } \right)\)
• B) \(\cos \left( 210 ^ { \circ } \right)\)
• C) \(\cos \left( 190 ^ { \circ } \right)\)
• D) \(\cos \left( 220 ^ { \circ } \right)\)

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