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2013-04-11 10:19:25 -0600 | asked a question | Solving an ODE system with initial conditions Hi! I want to solve system of equations with initial conditions: $x''(t)=-\gamma x'(t)$ $y''(t)=-g-\gamma y'(t)$ with the initial conditions: $$x(0)=0, y(0)=0, x'(0)=v_0 \cos(\theta), y'(0)=v_0 \sin(\theta).$$ I've solved this with Mathematica with no problem, but I don't know how to work in Sage, and friend has asked me for help. Now, I've searched a bit, and I made this: And I get, as a result this: Now, Mathematica will give me entirely different result. So what am I doing wrong? :\ I defined the variables, I defined the functions, made differential equations. I even tried solving the equations separately (without initial conditions), and the solutions are different. |

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