Write a MATLAB script to generate x-values ranging from - to using linspace with 100 points. Define four different y-values:

1. y1=sin(x)
2. y2=cos(x)
3. y3=sin(x)cos(x)
4. y4=sin2(x)

Plot these four curves on the same graph with varying line styles and colors. Include appropriate labels for the x-axis and y-axis, a title for the plot, and a legend.