PI=3.141592653589793
negPi=-3.141592653589793
negPiDiv2=-1.5707963267948966
expected=-1.5707963267948966
atan2=-1.5707963267948966
type_atan2=number
type_expected=number
atan2===expected=true
atan2==expected=true
diff=0
abs(diff)<1e-15=true