'- - File: IV_Der2.txt

Rx{t} = t
Ry{t} = (t^2)^0.5
Rz{t} = 0
R<t> = <Rx, Ry, 0>                         ' Don't use the parameter t in Rx{t} within <...>.

Rd{t} = Diff[Ry,t]
D<t> = <Rx, Rd, Rz>

t0 = -3  :  tf = 3  :  n = 100
Plot[R, D, {t, t0, tf, n}]

<t = 3>



