Write MATLAB code to generate and plot three different functions on a single graph within the range [3,3][3,3]. Plot these curves using different line styles, colors, and markers. Include appropriate labels for the axes, a title for the plot, and a legend that distinguishes between the three curves.

Functions to plot:

1. f(x)=sin(x)
2. g(x)=x^23x+2
3. h(x)=1/(1+e^(x))

Please write the MATLAB code that accomplishes this task.