The length of perpendicular from the cen...

The length of perpendicular from the centre to any tangent of the ellipse `x^2/a^2 + y^2/b^2 =1` which makes equal angles with the axes, is : (A) `a^2` (B) `b^2` (C) `sqrt(a^2-b^2)/2)` (D) `sqrt((a^2 + b^2)/2)`

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