Write the Given Expression as the Cosine of an Angle $$\cos 45 ^ { \circ } \cos 40 ^ { \circ } + \sin 45 ^ { \circ } \sin 40 ^ { \circ }$$

Write the given expression as the cosine of an angle.​ $$\cos 45 ^ { \circ } \cos 40 ^ { \circ } + \sin 45 ^ { \circ } \sin 40 ^ { \circ }$$

A) $\cos \left( 45 ^ { \circ } \right)$
B) $\cos \left( 5 ^ { \circ } \right)$
C) $\cos \left( - 80 ^ { \circ } \right)$
D) $\cos \left( 40 ^ { \circ } \right)$
E) $\cos \left( 85 ^ { \circ } \right)$

Correct Answer:

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