function rysujFunkcje(fh, a, b, deg)
    x = a:0.5:b;
    y = fh(x);
    xp = x*cos(deg)-y*sin(deg);
    yp = x*sin(deg)+y*cos(deg);
    figure
    plot(x,y,'r')
    hold on
    plot(xp,yp,'g')
end

fh -> f = @(x) x.^2-1;