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I can't make the axis thick and with an arrow. This is my code:enter image description here

\begin{tikzpicture}[xscale=0.8,yscale=0.8] \begin{axis}[axis line style = thick, domain=0:1, samples=50, axis lines*=middle, xtick={0,1},ytick=\empty,yticklabels={}] \addplot[color = black] {2/pi*asin(sqrt(x))}; \end{axis} \end{tikzpicture}
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    Hi Peter, welcome to the site! It's not obvious in your screenshot, but the axis lines actually are thicker. Try a more extreme example, like setting axis line style=ultra thick or axis line style={line width=2pt}. Commented Apr 8, 2016 at 12:59
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    And for arrows. just ad in style -> : axis line style={line width=1pt,->}. You can select arrows style like in TikZ. Commented Apr 8, 2016 at 13:16

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The arrow head disappears because your are using the option axis lines*=middle. Instead of this, you could do axis lines=middle,enlargelimits=true as in my example below.

The lines are already thick in your example. If the comments below your code do not help, you will have to show us a compilable MWE of your situation. 

% arara: pdflatex \documentclass{article} \usepackage{pgfplots} \pgfplotsset{compat=1.13} \begin{document} \begin{tikzpicture}[scale=0.8] \begin{axis}[% ,axis line style = thick ,domain=0:1 ,samples=50 ,axis lines=middle ,enlargelimits=true ,xtick={0,1},ytick=\empty ,yticklabels={} ] \addplot[color = black] {2/pi*asin(sqrt(x))}; \end{axis} \end{tikzpicture} \end{document}

enter image description here

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