Write a script to create six sub-plots in two columns and three rows. Each plot should have an appropriate title and labels on the x and y axes. The plot in the top left sub-plot should be y = sin(theta) for values of theta from -2pi to 2pi. Subsequent plots going across the rows before going down the columns should be of y = 2sin(theta), y = 3sin(theta) etc. to y = 6sin(theta) over the same range of theta.