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# Import math Library
import math
# Return the arc cosine of numbers
print(math.acos(0.55))
print(math.acos(-0.55))
print(math.acos(0))
print(math.acos(1))
print(math.acos(-1))
0.9884320889261531
2.15316056466364
1.5707963267948966
0.0
3.141592653589793