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I have a list of numbers and symbols.
How can I collect all the members of the list
which have a common denominator?

ex.  list={Sin[theta]/r, Cos[theta]/(r*s), 2*Csc[theta]/(2*r)}

 Say I want to collect all members of the list with r in the denominator;

 i.e.  answer=Sin[theta]/r;

Susan Rempe				   *
University of Washington		   *
Department of Chemistry		           *
Box 351700				   *
Seattle, WA  98195-1700		           *
(206)685-2951				   *
rempe at	                   *


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