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Update: The following is now possible, and should work in Sage 4.6, thanks to Burcin:
sage: x*x
x^2
sage: x.mul(x, hold=True)
x*x
sage: sin(2*pi)
0
sage: sin(2*pi,hold=True)
sin(2*pi)
More documentation can be found in each symbolic function, and x.mul? and x.add?.
