ParametricDerivative Command

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ParametricDerivative( <Curve> )
Returns a new parametric curve given by \left( x(t), \frac{y'(t)}{ x'(t)} \right) .
Example: ParametricDerivative(Curve(2t, t², t, 0, 10)) returns the parametric curve (x(t) = 2t, y(t) = t). The curve given as argument to the command is the function f(x) = \frac{x²}{4}, and the result is the derivative of that function: f'(x) = \frac{x}{2}.
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