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cot^-1 (ab +1)/(a-b) +cot^-1 (bc+1)/(b-c) +cot^-1 (ca+1)/(c-a) is equal to … (a) 0 (b) π/4 (c) 1 (d) 5

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cot-1 (ab +1)/(a-b) +cot-1 (bc+1)/(b-c) +cot-1 (ca+1)/(c-a)  is equal to …
(a) 0 (b) π/4 (c) 1 (d) 5

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cot-1 (ab +1)/(a-b) +cot-1 (bc+1)/(b-c) +cot-1 (ca+1)/(c-a)  is equal to … 

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