y = function('y', x)
d = diff(y, x, 1)*x - y - 3*(x**4) * ((cos(y/x))**2)==0
show(desolve(d, y, contrib_ode=True))

'''Error: NotImplementedError: Unable to use initial condition for this equation (lie).'''

Kreyszig-1.3-21-U (last edited 2010-12-18 11:25:00 by kenguva.monica)