Question 1083100
(i) A + B + C = {{{ tan^-1(3/16) + tan^-1(2/7) + tan^-1(1/3) = 10.619655^o + 15.945395^o + 18.434949^o  = highlight(45^o)}}}

(ii) The sum is unique because the problem states that A,B, and C are all acute angles.