From external point $$(x_1,y_1)$$:
Ellipse: $$\frac{xx_1}{a^2} + \frac{yy_1}{b^2} = 1$$
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CAT Formulas
Ellipse
Chord of Contact (Ellipse)
From external point $$(x_1,y_1)$$:
Ellipse: $$\frac{xx_1}{a^2} + \frac{yy_1}{b^2} = 1$$
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