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If the line lx+my+n=0 s a tangent to the...

If the line `lx+my+n=0` s a tangent to the hyperboal `(x^(2))/(a^(2))-(y^(2))/(b^(2))=1`, then show that `a^(2)l^(2)-b^(2)m^(2)=n^(2)`

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