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Re: Real and Imaginary Parts of complex functions
On 2013-02-26 06:09:00 +0000, Brentt said: > 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? You can use ComplexExpand for this. In:= ComplexExpand[Re[1/(x + y I)]] Out= x/(x^2 + y^2) See also http://mathematica.stackexchange.com/q/9340/12 and the links within.