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Re: Taking the Arg of a complex number


If you put phi in the principle range, then it works:

In[1]:= FullSimplify[Arg[A Exp[I phi]], A > 0 && -Pi < phi <= Pi]
Out[1]= phi

c.f.

In[2]:= FullSimplify[Arg[A Exp[I phi]], A > 0 && 0 < phi < 2 Pi]
Out[2]= Arg[E^(I phi)]



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