Chord of Contact
Category : JEE Main & Advanced
If PQ and PR be the tangents through point \[P({{x}_{1}},{{y}_{1}})\] to the ellipse \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1,\] then the equation of the chord of contact QR is \[\frac{x{{x}_{1}}}{{{a}^{2}}}+\frac{y{{y}_{1}}}{{{b}^{2}}}=1\] or \[T=0\] at \[(\,{{x}_{1}},{{y}_{1}})\].
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