Solve the problem.Express 45° as ? - ?, where cos ? and cos ? are known exactly.
A. 165° - 120°
B. 80° - 35°
C. 163° - 118°
D. 167° - 122°
Answer: A
Mathematics
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? 
B. 
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A. 
B. - 
C. 2
D. - 2
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A. 165 B. 155 C. 153 D. 154
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