Question

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

Answer 1

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