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If the portion of the line xcos alpha + ...

If the portion of the line `xcos alpha + y sin alpha = p` intercepted by the ellipse `(x^2)/(a^2) + (y^2)/(b^2) = 1` subtends a right angle at the centre of the ellipse, then the line touches a cirlce of radius `ab//sqrt((a^2 + b^2))` concentric with the ellipse.
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