Question

If ∑tan^-1(3/(9r² + 3r - 1)) = cot^-1(m/n) for r ∈ [r =1, 10]  where m and n are co-prime, find the value of (2m + n + 4)

Answer 1

Hence, the value of (2m + n + 4)

= 26 + 6 + 4

= 36