If p is the length of the perpendicular ...

If p is the length of the perpendicular from a focus upon the tangent at any point P of the the ellipse `x^2/a^2+y^2/b^2=1` and r is the distance of P from the focus , then `(2a)/r-(b^2)/(p^2)` is equal to

A

`a ^(2) x ^(2) + b ^(2) y ^(2) = (ax -by ) ^(2)`

B

`x ^(2) +y ^(2) = a ^(2)`

C

`x ^(2) +y ^(2) =4`

D

none of these

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The correct Answer is:

B

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