Chord of contact from an external point (Chord of contact from (x₁,y₁): same T=0 replacement as tangent but point)
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Chord of contact from (x₁,y₁): same T=0 replacement as tangent but point is external
What each symbol means
| Symbol | What it stands for |
|---|---|
| T | Polar form from circle S=0 |
| (x_1,y_1) | External point |
When to use this
Point outside circle.