1.

Prove that the pair of linesjoining the origin to the intersection ofthe curve (x^2)/(a^2)+(y^2)/(b^2)=1by the line lx+my+n=0 are coincident, if a a^2l^2+b^2m^2=n^2

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ANSWER :`RARR a^2l^2+b^2m^2=n^2`


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