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Focal Distances in Parametric Form
For:
$$P(a\cos\theta,b\sin\theta)$$
and foci:
$$S_1(-c,0),\quad S_2(c,0)$$
the focal distances are:
$$PS_1=a+c\cos\theta$$
$$PS_2=a-c\cos\theta$$
Usage
- Used to calculate distances from a parametric point to the two foci directly.
