Engineering
Mathematics
Tangent to Ellipse
Question

The locus of the foot of perpendicular drawn from the centre of the ellipse x2 + 3y2 = 6 on any tangent to it is

(x2 – y2)2 = 6x2 + 2y2

(x2 + y2)2 = 6x2 – 2y2

(x2 + y2)2 = 6x2 + 2y2

(x2 – y2)2 = 6x2 – 2y2

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Solution

T: y = mx

(k – mh)2 = 6m2 + 2

where m =hk 

(k+h2k)2 = 6h2k2+ 2

(x2 + y2)2 = 6x2 + 2y2