\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\newcommand{\R}{\mathbb{R}}
\date{Due Tuesday, 4/23}
\title{Math 104 Homework 11 (Vaintrob)}
\author{}
\begin{document}
\maketitle

\section{28.3}
\section{28.8}
\section{29.1}
\section{29.2} You may use $\cos' = -\sin$.
\section{29.8}
\section{Extra credit: 29.18}


\end{document}