In fact it's not just bc -l, but also when I calculate the following in C (linked with -lm)
C = (180.0 - A) - B; a = (double)(c / sin(C)) * sin(A); b = (double)(c / sin(C)) * sin(B); Some may recognize this as parts of the Law of Sines. pjp@neptune$ bc -l (9 / s(70)) * s(76) 6.58357679385302895866 When I do it with xcalc I get the correct 9.2931043. What am I doing wrong? How must I massage my system the correct way? The wrong number was observed on arm64 (bc -l) and amd64 (CGI). Best Regards, -peter