\documentclass[10pt, a4paper, landscape]{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}
\pagestyle{empty}
\usepackage[top=20mm, bottom=20mm, left=2mm, right=20mm,nohead]{geometry}
\begin{document}
	\definecolor{ccqqqq}{rgb}{0.8,0,0}
	\definecolor{qqwuqq}{rgb}{0,0.39215686274509803,0}
	\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1cm,y=1cm]
		\begin{axis}[
			x=1cm,y=1cm,
			axis lines=middle,
			ymajorgrids=false,
			xmajorgrids=false,
			xmin=-14,
			xmax=14,
			ymin=-5,
			ymax=5,
			xtick={-14,-12,...,12},
			ytick={-5,-3,...,3},]
			\clip(-4*pi-1,-5) rectangle (4*pi+1,5);
			\draw[line width=1.5pt,line cap=round,line join=round,color=qqwuqq,smooth,samples=50,domain=-4*pi:4*pi] plot(\x,{sin(((\x))*180/pi)});
			\draw[line width=1.5pt,line cap=round,line join=round,color=ccqqqq,smooth,samples=50,domain=-4*pi:4*pi] plot(\x,{-cos(((\x))*180/pi)});
			\begin{scriptsize}
				\draw[color=qqwuqq] (3*pi/2,-1.5) node {$f(x)=\sin x$};
				\draw[color=ccqqqq] (pi,1.5) node {$g(x)=-\cos x$};
			\end{scriptsize}
		\end{axis}
	\end{tikzpicture}
\end{document}