Using Euler's Method, Solve dy/dx = x² - y, y(0) = 1, h = 0.1 at x = 0.1, 0.2, 0.3, 0.4. Compare the results with exact solution. Using Heun's Method. Solve dy/dx = y-x/y+x, y(0) = 1, h = 0.2 at x = 1. Solve y = x + y + xy, y(0) = 1, h = 0 025. Find y(0.1) using Improved Euler's Method.