In SageMath, vector fields can be easily plotted with the plot_vector_field command. For example, the vector field in Figure 1.39 on the previous page was plotted with the command var("x, y") plot_vector_field([0.9*x-0.5*y, 0.1*x+0.8*y], (x, -10, 10), (y, -10, 10) , axes_labels=["x", "y"]) Redo the shark-tuna vector field (green arrows in Figure 1.38) and the spring with friction vector field X = V V = X V using plot_vector_field. Make sure to use a reasonable state space and label the axes correctly.

3. In SageMath, vector fields can be easily plotted with the plot_vector_field command. For example. the vector field in Figure 1.39 on the previous page was plotted with the command var(\"x. y") plot_vector_field([B.9*X-B-5*Y. 9-1*X+9-3*Y1r (x, '13' 13" (y, '13' 10) , axes_labels=[\"x\