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import math

math.acos(x)

#!/usr/bin/python3
import math

print("acos(0.64) : ", math.acos(0.64))
print("acos(0) : ", math.acos(0))
print("acos(-1) : ", math.acos(-1))
print("acos(1) : ", math.acos(1))

acos(0.64) :  0.8762980611683406
acos(0) :  1.5707963267948966
acos(-1) :  3.141592653589793
acos(1) :  0.0