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Substitute all known relations in result
Hi, How do I make mathematica to display results with all known relations / variables? E.g. if a result is x^2+y^2 and before I'd defined r = x^2+y^2 I'd like mathematica to display the result rather as "r". And: I'd like mathematica to do this for each relation defined before w/o specifying every possible replacement. Any help much appreciated.