Hyperbola
8.0 Chord of contact
8.0 Chord of contact
Equation to the chord of contact $QR$ of tangents drawn from a point $P({x_1},{y_1})$ to the hyperbola $\frac{{{x^2}}}{{{a^2}}} - \frac{{{y^2}}}{{{b^2}}} = 1$ can be find out using $$T=0$$
where $$T \equiv \frac{{x{x_1}}}{{{a^2}}} - \frac{{y{y_1}}}{{{b^2}}} - 1$$
