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Prove that the pair of lines joining th...

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

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The correct Answer is:
`rArr a^2l^2+b^2m^2=n^2`
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