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Chord of Contact from a Point on the Major Axis
For an external point:
$$P(x_1,0)$$
the chord of contact is:
$$\frac{xx_1}{a^2}=1$$
or:
$$x=\frac{a^2}{x_1}$$
Usage
- Used to find the chord joining the points of contact of tangents drawn from a point on the major axis.
