||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
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).'''

}}}

/* code_ends */

 * '''Solution by''': 
   * <Monica>, <student>, <SNIST>