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import math

math.atan2(y, x)

#!/usr/bin/python3
import math

print("atan2(-0.50,-0.50) : ", math.atan2(-0.50,-0.50))
print("atan2(0.50,0.50) : ", math.atan2(0.50,0.50))
print("atan2(5,5) : ", math.atan2(5,5))
print("atan2(-10,10) : ", math.atan2(-10,10))
print("atan2(10,20) : ", math.atan2(10,20))

atan2(-0.50,-0.50) :  -2.356194490192345
atan2(0.50,0.50) :  0.7853981633974483
atan2(5,5) :  0.7853981633974483
atan2(-10,10) :  -0.7853981633974483
atan2(10,20) :  0.4636476090008061