\clip

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]

\clip (-2,-2) rectangle (2,2);

\draw[->,color=black] (-4.3,0) -- (12.84,0);

\foreach \x in {-4,-3,-2,-1,1,2,3,4,5,6,7,8,9,10,11,12}

\draw[shift={(\x,0)},color=black] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};

\draw[->,color=black] (0,-5.92) -- (0,6.3);

\foreach \y in {-5,-4,-3,-2,-1,1,2,3,4,5,6}

\draw[shift={(0,\y)},color=black] (2pt,0pt) -- (-2pt,0pt) node[left] {\footnotesize $\y$};

\draw[color=black] (0pt,-10pt) node[right] {\footnotesize $0$};

\clip(-4.3,-5.92) rectangle (12.84,6.3);

\draw[smooth,samples=100,domain=0:12.84] plot(\x,{sqrt((\x))});

\draw(0,0) circle (1cm);

\end{tikzpicture}