feat: added section 1

main.tex

@@ -0,0 +1,36 @@
+%!TEX encoding = utf-8
+\documentclass[12pt]{article}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage{amsthm}
+\usepackage{mathtools}
+\usepackage{kotex}
+\usepackage{geometry}
+\geometry{
+    top = 20mm,
+    left = 20mm,
+    right = 20mm,
+    bottom = 20mm
+}
+
+\usepackage{enumitem}
+\setlist[enumerate,1]{label={(\arabic*)}}
+
+\pagenumbering{gobble}
+\renewcommand{\baselinestretch}{1.3}
+\newcommand{\ds}{\displaystyle}
+
+\theoremstyle{definition}
+\newtheorem{problem}{\sffamily}
+\newcommand{\prob}[1]{\begin{problem}#1\end{problem}~}
+
+\input{macro.tex}
+
+\begin{document}
+\begin{center}
+\textbf{\Large 고난도 미적분}
+\end{center}
+
+\input{sections/sec01.tex}
+
+\end{document}