documentclass[12pt,a4paper,twoside]{book}
usepackage[utf8]{inputenc}
usepackage[pdftex]{graphicx}
usepackage[miktex, subfolder]{gnuplottex}

begin{document}
begin{figure}[h]
    label{fig:wenaRes}
    begin{gnuplot}[terminal=cairolatex, terminaloptions = {size 15cm, 15cm}]
        set style line 11 lc rgb '#808080' lt 1
        set border 3 back ls 11
        set tics nomirror
        set xlabel "x"
        set ylabel "y"

        set multiplot layout 2, 1 title 'Multiplot title'
        plot [-4:4] sin(x) with lines
        plot [-4:4] cos(x) with lines


    end{gnuplot}
end{figure}
end{document}