' - - File:XIVe  ' 2nd Order differential equation.

F{t,x,y} =   t*y + (1 - t)x
G{t,x,y} =  (1 - t)y - t*x

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to = -2: tf = 6:   xo = 2  :  yo = 2

IVP[F,G,{to,tf,xo,yo}{1.00, 0.05,2}]    ' <-- Mode 2 used.

' Check out the phase response. Set x- & y-scales to 20 units.
' Review P.3 of documents for implied multiplication and (optional) to omit " * " symbol.


