두 가지 방법을 시도했는데요, 하나는 minipage 환경을 이용하는 것이고, 하나는 tabular 환경을 이용한 것입니다. 그런데 둘 다 수직 align이 잘 맞지 않고(특히 tabular가 그랬습니다.), minipage는 수식과 그림 사이의 거리가 너무 넓네요. 제 머리로는 도저히 해결할 수가 없습니다 ㅠㅜㅜㅜㅜ 도와주세요

\documentclass[a4paper]{oblivoir}
\usepackage[a4paper, top=2cm, bottom=2cm, left = 2cm, right = 2cm]{geometry}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{shapes, arrows, angles, quotes}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{physics}
\renewcommand{\v}[1]{\mathbf{#1}}
\newcommand{\proj}[2]{\mathrm{proj}_\v{#1}(\v{#2})}
\newcommand{\seperate}[2]{\hspace{.05\linewidth}
\begin{minipage}{.45\linewidth} #1 \end{minipage}
\begin{minipage}{.45\linewidth} #1 \end{minipage}
\begin{minipage}{.45\linewidth} #2 \end{minipage}
\begin{minipage}{.45\linewidth} #2 \end{minipage}
}

\begin{document} 
    \begin{center} 
        \seperate{\begin{tikzpicture} 
            \coordinate (o) at (0,0); 
            \coordinate (u) at (1,3); 
            \coordinate (v) at (4,0); 
            \draw[thick, ->] (o) -- (u) node[midway, above left] {$\v{u}$}; 
            \draw[thick, ->] (o) -- (v) node[midway, below] {$\v{v}$}; 
            \draw[ForestGreen, very thick, ->] (o) -- (1,0) node[midway, below] {$\proj{v}{u}$}; 
            \pic [draw, ->, "$\theta$", angle eccentricity=1.5] {angle = v--o--u}; 
            \draw[dashed] (1,0) -- (1,3); 
            \end{tikzpicture}}{\(  
            \begin{aligned} 
            \proj{v}{u} &= \norm{\v{u}}\cos\theta \cdot \frac{\v{v}}{\norm{\v{v}}}\\ 
            &= \norm{\v{u}} \cdot \frac{\v{u} \circ \v{v}}{\norm{\v{u}}\norm{\v{v}}} \cdot \frac{\v{v}}{\norm{\v{v}}} \\ 
            &= \proj{v}{u} = \frac{\v{u}\circ\v{v}}{\v{v}\circ \v{v}} \v{v} 
            \end{aligned} 
            \)} 
    \end{center} 
\end{document}

\documentclass[a4paper]{oblivoir}
\usepackage[a4paper, top=2cm, bottom=2cm, left = 2cm, right = 2cm]{geometry}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{arrows, angles, quotes}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{physics}
\renewcommand{\v}[1]{\mathbf{#1}}
\newcommand{\proj}[2]{\mathrm{proj}_\v{#1}(\v{#2})}

\begin{document} 
    \begin{center} 
        \begin{tabular}{c c} 
            \hline 
            \begin{tikzpicture} 
            \coordinate (o) at (0,0); 
            \coordinate (u) at (1,3); 
            \coordinate (v) at (4,0); 
            \draw[thick, ->] (o) -- (u) node[midway, above left] {$\v{u}$}; 
            \draw[thick, ->] (o) -- (v) node[midway, below] {$\v{v}$}; 
            \draw[ForestGreen, very thick, ->] (o) -- (1,0) node[midway, below] {$\proj{v}{u}$}; 
            \pic [draw, ->, "$\theta$", angle eccentricity=1.5] {angle = v--o--u}; 
            \draw[dashed] (1,0) -- (1,3); 
            \end{tikzpicture} & 
            \(  
            \begin{aligned} 
            \proj{v}{u} &= \norm{\v{u}}\cos\theta \cdot \frac{\v{v}}{\norm{\v{v}}}\\ 
            &= \norm{\v{u}} \cdot \frac{\v{u} \circ \v{v}}{\norm{\v{u}}\norm{\v{v}}} \cdot \frac{\v{v}}{\norm{\v{v}}} \\ 
            &= \proj{v}{u} = \frac{\v{u}\circ\v{v}}{\v{v}\circ \v{v}} \v{v} 
            \end{aligned} 
            \) \\ 
            \hline 
        \end{tabular} 
    \end{center} 
\end{document}