order4dORDER4D Situs Game On. Situs Resmi Terbesar di Indonesia. Paling gampang mainnya, mudah maxwinnya. DAFTARWe can solve a second order differential equation of the type: d 2 ydx 2 + P(x) dydx + Q(x)y = f(x). where P(x), Q(x) and f(x) are functions of x, by using: Undetermined Coefficients which only