ParametricDerivative Command

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ParametricDerivative[<Curve x=x(t), y=y(t)>]
Returns a new parametric curve given by (x(t), \frac{y'(t)}{ x'(t)}).
Example: ParametricDerivative[Curve[2t, t², t, 0, 10]] (which equates to function f(x)= \frac{x²}{4}) returns the parametric curve (x(t)=2t,y(t)=t) (which equates to the derivative of the function f'(x)= \frac{x}{2}).
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