I give Mathematica these commands:
`enter code here`$Assumptions = Element[x, Reals] && Element[y, Reals]
`enter code here`\[Theta] = ArcTan[x, y]
`enter code here`z = Exp[I \[Theta]]
`enter code here`Conjugate[z]
I get
`enter code here`E^(-I Conjugate[ArcTan[x, y]])
How do I get Mathematica to recognize that ArcTan[x,y] is real?