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Finding real part (newbie question)


If a,b,c,d are real numbers. How do I use mathematica to find the real
part of

1/(a + I b + 1/(c + I d))

Yes I can calculate it by hand, but I would like to know how to use
Mathematica.
-- 

			Niels Langager Ellegaard	
			'http://mmf.ruc.dk/~gnalle/'


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