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Find the locus of mid points of the chor...

Find the locus of mid points of the chord of contact of `x^(2)+y^(2)=a^(2)` from the points lying on the line `lx+my+n=0`

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The correct Answer is:
`a^(2)(lx+my)n+n(x^(2)+y^(2))=0`
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