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If the length of the perpendicular from the point `(1,1)` to the line `a x-b y+c=0` be unity, show that `1/c+1/a-1/b=c/(2a b)`

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Length of the perpendicular from the point (1,1) to the line ax−by+c=0 is
=`​(a(1)−b(1)+c)/sqrt(a^2+b^2)​`
So, `(a−b+c)/sqrt(a^2+b^2)​=1`
...
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