. Find the region of absolute statibility for Heun's method and the Crank-Nicolson (trapezoidal) method.

Crank-Nicolson method (trapezoidal) h Uj+1 = u; + (f; + fj+1). Heun method (Runge-Kutta 2) h Uj+1 = U; + 5(f; + f(tj+1, U; +hf;)). Crank-Nicolson method (trapezoidal) h Uj+1 = u; + (f; + fj+1). Heun method (Runge-Kutta 2) h Uj+1 = U; + 5(f; + f(tj+1, U; +hf;))