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The normal at the point $\left(\mathrm{bt}_1{ }^2, 2 \mathrm{bt}_1\right)$ on a parabola meets the parabola again in the point $\left(\mathrm{bt}_2{ }^2, 2 \mathrm{bt}_2\right)$, then
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$t_2=-t_1-\frac{2}{t_1}$
$t_2=-t_1-\frac{2}{t_1}$
Fundamental theorem (fact) $t_2=-t_1-\frac{2}{t_1}$
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