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If P and P denote the length of the ...

If P and P denote the length of the perpendicular from a focus and the centre of an ellipse with semi - major axis of length a, respectively , on a tangent to the ellipse and r denotes the focal distance of the point , then

A

ap = rp'

B

rp =ap'

C

ap=rp'+1

D

ap'+rp=1

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a
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