On Tue, Nov 30, 2021 at 08:38:27AM +0100, Peter J. Philipp wrote:
> 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
>
You are using degrees instead of radians.
-Otto
