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(i) If the length of perpendicular from ...

`(i`) If the length of perpendicular from origin to the line `ax+by+a+b=0` is `p`, then show that :
`p^(2)-1=(2ab)/(a^(2)+b^(2))`
`(ii)` If the length of perpendicular from point `(1,1)` to the line `ax-by+c=0` is unity then show that :
`(1)/(a)-(1)/(b)+(1)/(C )=(c )/(2ab)`

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NAGEEN PRAKASHAN-STRAIGHT LINES-Exercise
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