Book
Advanced Engineering Mathematics
Author
Erwin Kreyszig
Edition
8th Edition
reset() x = var('x') y = function('y',x) # define y a function of x DE = diff(y,x)-(y +4*x)*(y+4*x) print 'DE:';show(DE) u = function('u',x) DE = DE.subs({y:u-4*x,diff(y,x):diff(u-4*x,x)}) # substituting y/x as u soln = desolve(DE,u) soln = soln.simplify_full() print 'Solution:';show(soln)
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