|   | 1 |  initial version  | 
Possible workaround :
sage: var("x, omega, t");
sage: u=function("u")
sage: def eq():return u(1)==cos(omega*t)
sage: eq()
u(1) == cos(omega*t)
sage: u(x)=e^(2*t*x)
sage: eq()
e^(2*t) == cos(omega*t)
But I fail to see the point...
HTH,
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.