A hand-held calculator will suffice for Problems 1 through 8. In each problem an initial value problem and its exact solution are given. Approximate the values of x (0.2) and y(0.2) in three ways:

(a) By the Euler method with two steps of size h = 0.1;

(b) by the improved Euler method with a single step of size h = 0.2; and

(c) By the Runge-Kutta method with a single step of size h = 0.2.

Compare the approximate values with the actual values x (0.2) and y(0.2).

x = x - 2y, x(0) = 0, y' = 2x + y, y(0) = 4; x (t) = -4e sin 2t, y(t) = 4e cos 2t