Create MATLAB code that generates and plots four different mathematical functions on the same graph within the range [2,2][2,2]. 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 four curves.

Functions to plot:

1. f(x)=x^32x^2+x+1
2. g(x)=sin(x)/x (Note: Handle the case when x=0 to avoid division by zero)
3. h(x)=e^(x^2)
4. j(x)=1/(1+e^(x))

Please write the MATLAB code that accomplishes this task.