E EinStone Nov 2009 169 2 May 18, 2010 #1 How do I reduce this ODE into a system of 2 variables of first oder? \(\displaystyle y'' + (2y^2+3y'^2-1)y' + y = 0\)

How do I reduce this ODE into a system of 2 variables of first oder? \(\displaystyle y'' + (2y^2+3y'^2-1)y' + y = 0\)

Z zzzoak Mar 2010 280 122 May 18, 2010 #2 Please try this \(\displaystyle u=y'\) \(\displaystyle v=y\)