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displaying unevaluated arguments


Is there a simple way to create the string form of an argument passed 
to a function/module? For instance, let

f[x_] := Module[ Some Mathematica Code... .];

Assume that y is defined as a list of numbers. If I evaluate


I would like to get back   "{y^2,Sin[y],Log[y],Map[Cos[#]&,y]}" ,
rather than the evaluated numerical values. When I create a function, 
HoldForm does not seem to work. The arguement is always evaluated



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