Identify ? and ? in the following expression which is the right side of the formula for cos (? - ?).cos (155°) cos (35°) + sin (155°) sin (35°)
A. ? = 35°, ? = 155°
B. ? = 155°, ? = 35°
C. ? = - 35°, ? = 155°
D. ? = -155°, ? = 35°
Answer: B
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