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Question 2
If the line 
to touches the ellipse 
, then
to touches the ellipse , then
Question 3
If 
and 
denote the lengths of the perpendicular from a focus and the centre of an ellipse with semi-major axis of length 
, respectively, on a tangent to the ellipse and 
denotes the focal distance of the point, then
and denote the lengths of the perpendicular from a focus and the centre of an ellipse with semi-major axis of length , respectively, on a tangent to the ellipse and denotes the focal distance of the point, then
Question 4
The equation of the ellipse whose vertices are at 
and foci at 
is
and foci at is
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