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Original Message (ID '151322') By jf:
In Response To 'Re: Re: Abs of a complex number' --------- Using these TargetFunctions is not obvious. This is a way to tell ComplexExpand to try harder. In[4]:= ComplexExpand[Abs[1/(1 + I*w)], TargetFunctions -> {Re, Im}] Out[4]= 1 ------------ Sqrt[1 + w^2 ]