固定尺寸的数学框

Question

有没有办法编码：

\begin{aligned}
& \boxed{\cos(30)}~x + \boxed{-\cos(20)}~y = \boxed{0} \\
& \boxed{-\sin(30)}~x + \boxed{\sin(20)}~y = \boxed{100} \\
\end{aligned}

并且有固定尺寸的盒子，像这样：

Answer 1

如果问题是能否让所有箱子的宽度相同，答案是可以的eqparbox。

\documentclass{article}
\usepackage{amsmath}
\usepackage{eqparbox}
\newcommand{\Boxed}[2][A]{\fbox{\eqmakebox[#1][c]{$\mathstrut#2$}}}
\begin{document}
\[\begin{aligned}
 \Boxed{\cos(30)}~x + \Boxed{-\cos(20)}~y &= \Boxed{0} \\
 \Boxed{-\sin(30)}~x + \Boxed{\sin(20)}~y &= \Boxed{100} \\
\end{aligned}\]
\end{document}