\documentclass[letterpaper,12pt]{article}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath}
\usepackage[letterpaper,margin=1in,includehead=true]{geometry}
\usepackage{comment}
\usepackage{graphicx}
\usepackage{fancyhdr}
\usepackage{enumerate}
\pagestyle{fancy}
\usepackage{color}
\usepackage{wrapfig}
%\usepackage{enumitem}
\usepackage{tikz, tikz-3dplot, pgfplots}
\usetikzlibrary{calc}
%\usepackage{titling}
%\setlength{\droptitle}{-1.5in}

%opening
\title{\vspace*{-1.5in}\textbf{Math 2300-013: Solids of Revolution}}
\date{}
\author{}

\begin{document}

\maketitle
%\underline{Math 1300-400: Quiz 1}
\lhead{Math 2300-013: Calculus II}
\chead{Sept. 22, 2017}
\rhead{Solids of Revolution}
\vspace{-.5in}
\noindent
\textbf{Suggested Steps:}
\begin{enumerate}
\item Sketch the region and axis about with the region is rotated
\item Decide on $dx$ or $dy$ and draw a tiny rectangle:\vskip1cm
\item Sketch a cross-section:\vskip2cm
\item Find the change in volume, $dV$. (Substitute so all of the ``pieces" are in $x$ for a $dx$ integral or $y$ for a $dy$ integral.)
\item Use an integral to sum up the volumes of the cross-sections. (Slide the rectangle you drew in Step 2 along to find the limits on your integral.)
\end{enumerate}
\noindent
\textbf{Examples:}\vskip12pt
\begin{enumerate}
 \item In this example, we will find the volume of the sphere of radius $r$. Let $\mathcal{R}$ be the region bounded by the semicircle $y = \sqrt{r^2-x^2}$ and the $x$-axis. Find the volume of the solid generated by rotating $\mathcal{R}$ around the $x$-axis.\\[12pt]
\textbf{Method I: Washers/Disks:}
\newpage
\textbf{Method II: Shells:}\vskip4in
\item Let $\mathcal{R}$ be the region bounded by the curves $y=2\sin{x}$ and $y = \tan{x}$ in the interval $[0, \pi/2)$. Find the volume of the solid formed by rotating $\mathcal{R}$ around
\begin{enumerate}[(a)]
\item the line $y=-2$;
\item the line $x = -1$.
\end{enumerate}\newpage
\phantom{heheh}
\end{enumerate}
\end{document}
