Q 1380112917.     Find the locus of feet of perpendicular from the foci on and tangent to an ellipse?

A

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

B

`x+y=a^2`

C

`2x^2+3y^2=a^2`

D

none of these

HINT

The equation of tangent in terms of slope `(m)` `y=mx+sqrt{a^2m^2+b^2}`
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