D - second order ODEs
PX153 - D1 - definitions
PX153 - D2 - solving 2nd order homogeneous ODEs
PX153 - D3 - reducing a non-linear ODE to a linear ODE
PX153 - D1 - definitions
PX153 - D2 - solving 2nd order homogeneous ODEs
PX153 - D3 - reducing a non-linear ODE to a linear ODE