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If A = 1/1 cot ^(-1) (1/1) + 1/2 cot^(-...

If ` A = 1/1 cot ^(-1) (1/1) + 1/2 cot^(-1) (1/2) + 1/3 cot ^(-1) ( 1/3) " and " B = 1 cot^(-1) ( 1) + 2 cot^(-1) (2) + 3 cot^(-1) (3) " then " |B - A| " is equal to " (api)/b + c/d cot ^(-1) (3) `
where `a,b,c,d in N` are in their lowest form , find ` ( b -a - c - d) `

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