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

I will send me the same compound as I have to go to the