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Q.

Which of the following points lies on the locus of the foot of perpendicular drawn upon  any tangent to the ellipse x24+y22=1 from any of its foci?

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a

1, 2

b

−2, 3

c

−1, 2

d

−1, 3

answer is D.

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Detailed Solution

Question is the definition of Auxiliary circle Hence the auxiliary circle of x24+y22=1 is x2+y2=4 satisfies (-1,3)
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