Solve the equation for ? if 
. Do not use a calculator.
?
2cos ? + 1 = 0
?
A. 60°; 120°
B. 45°; 315°
C. 120°; 240°
D. 60°; 300°
E. 45°; 45°
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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