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Tangents at the Ends of a Focal Chord
For a focal chord with endpoint parameters $$t_1,t_2$$:
$$t_1t_2=-1$$
The corresponding tangents are:
$$t_1y=x+at_1^2$$
$$t_2y=x+at_2^2$$
Usage
- Used in problems involving the tangents associated with a focal chord.
