I have declared a function Omega of a single variable t through:

Omega = function('Omega')(t)

Afterwards, I have calculated a quantity whose generic result is given in 
terms of the derivative of Omega (let us call it dOmega), for instance:

quanti = Omega(t)*cos(t) + dOmega(t)

Since I know the particular form for this quantity in the case Omega is 
constant, how can I make Sage assume, in this generic result, that Omega is 
constant, so that I can really verify the validity of the generic 
expression in this particular case? Of course we have to recover then:

quanti = Omega(t)*cos(t)

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