sind 함수 안쓰고도 그릴 수 있습니다.

\documentclass[margin=2pt]{standalone}
\usepackage{luamplib}
\begin{document}
\begin{mplibcode}
u := 50;
beginfig(0);
drawarrow (down -- up) scaled u;
drawarrow origin -- right scaled 370;
draw origin
for i=1 upto 360:
  .. (i, u * ypart dir i)
endfor
withpen pencircle scaled 1.5;
endfig;
\end{mplibcode}
\end{document}