node pin 3

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usepackage{fouriernc} %jenis huruf teks & matematis

\begin{document}

\begin{tikzpicture}[font=\scriptsize]
\clip (-.5,-1.5) rectangle (7.3,2);
\draw[-stealth] (-.5,0)--(7,0) node[right,black]{$X$};
\draw[-stealth] (0,-1.5)--(0,1.5) node[above,black]{$Y$};

\draw[domain=0:2*pi,samples=200,smooth,red] plot(\x,{sin(\x r)}) ;
\draw[domain=0:2*pi,samples=200,smooth,blue] plot(\x,{cos(\x r)}) ;

\path[shift={(2.2,.7)}]node[pos=.5,pin={[pin distance=.5cm,pin edge={ultra thin,gray!80}]30:$y=\sin x^\circ$}](A){}(3,2);
\path[shift={(2.5,-.7)}]node[pos=.5,pin={[pin distance=.5cm,pin edge={ultra thin,gray!80}]210:$y=\cos x^\circ$}](B){}(3,-2);

\node[below,shift={(-.1,0)}] at (pi/2,0) {$90$};
\node[below,shift={(-.1,0)}] at (pi,0) {$180$};
\node[below,shift={(.1,0)}] at (3/2*pi,0) {$270$};
\node[below,shift={(.1,0)}] at (2*pi,0) {$360$};
\node[below,shift={(-.15,.05)}] at (0,0) {$O$};
\end{tikzpicture}
\end{document}