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Prove that the straight line lx+my+n=0 i...

Prove that the straight line `lx+my+n=0` is a normal to the ellipse `x^(2)/a^(2)+y^(2)/b^(2)=1` if `a^(2)/l^(2)+b^(2)/m^(2)=(a^(2)-b^(2))^(2)/n^(2)`.

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