What a Beautiful Curve!

Calculus Level 2

Consider the curve defined by the parametric equation: { x = t 1 + t 3 y = t 2 1 + t 3 , t 1 \begin{cases} x=\frac { t }{ 1+{ t }^{ 3 } } \\ y=\frac { { t }^{ 2 } }{ 1+{ t }^{ 3 } } \end{cases},\quad t\neq -1

Suppose that 3 tangents are drawn at 3 distinct points on the curve, and the 3 points are collinear.

Now is where things come crazy

Given that each tangent intersects the curve once again at a point other than the tangent point, would these points of intersection be collinear also?

Big Hint: you may use the fact that P ( t 1 ) P({ t }_{ 1 }) , P ( t 2 ) P({ t }_{ 2 }) , P ( t 3 ) P({ t }_{ 3 }) are collinear iff t 1 t 2 t 3 = 1 { t }_{ 1 }{ t }_{ 2 }{ t }_{ 3 }=-1 , where P ( t ) P( t ) denotes any points on the curve with parameter t t .

Extra challenge: Prove the Hint please

If the answer is sometimes, please include the specific condition(s) in the solution

Yes, always No, never Sometimes, with special condition(s)

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