Write the Given Expression as the Cosine of an Angle $\cos 30 ^ { \circ } \cos 50 ^ { \circ } + \sin 30 ^ { \circ } \sin 50 ^ { \circ }$

question 20

Multiple Choice

Write the given expression as the cosine of an angle. $\cos 30 ^ { \circ } \cos 50 ^ { \circ } + \sin 30 ^ { \circ } \sin 50 ^ { \circ }$

• A) \(\cos \left( 50 ^ { \circ } \right)\)
• B) \(\cos \left( - 20 ^ { \circ } \right)\)
• C) \(\cos \left( 80 ^ { \circ } \right)\)
• D) \(\cos \left( 30 ^ { \circ } \right)\)
• E) \(\cos \left( - 100 ^ { \circ } \right)\)

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