
Re: Real and Imaginary Parts of complex functions
Posted:
Feb 27, 2013 3:04 AM


On Feb 26, 2013, at 1:09 AM, Brentt <brenttnewman@gmail.com> wrote:
> > Hello, > > I was wondering why this works > > IN[]:= Refine[Re[x + y I], Element[x , Reals] && Element[y , Reals]] > > Out[]:= x > > But this does not > > In[]:= Refine[Re[1/(x + y I)], Element[x , Reals] && Element[y , Reals]] > > Out[]:= Re[1/(x + y I)] > > > > Is there a nice built in way to get the real and imaginary parts of a > complex function?
(Debug) In[1]:= ComplexExpand[Re[1/(x+I y)]] (Debug) Out[1]= x/(x^2+y^2)

