SolveTD:

Path: Orbit/Glideslope

% Derivative function to pass to NewtRaph for solving the period 
  of a glideslope given the initial and final velocities.
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  Form:
  y = SolveTD( vI, vT, rho0, T )
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  Inputs
  ------
   vI    (1,:) Initial velocity
   vT    (1,:) Terminal velocity
   rho0  (1,1) Weight on ratio of terminal to initial velocity
   T     (1,1) Weight on difference in terminal and initial velocity
 
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   Outputs
   -------
   y     (1,:) Cost

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