Question: Solving system of Diff eq. then using results to solve another diff eq.

Greetings, For a college math project i am plotting a rocket trajectory to mars using maple. First i solved a system of D.E.'s to get the position of the earth (x(t),y(t),z(t)) as a function of time. Then i did the same thing for mars. however when i use these results to solve the D.E. for the a rocket trajectory i get an error. I will post my code. Any help would be very much appreciated. Download
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