Solve the heat problem (1)–(3) by the explicit method with h = 0.2 and k = 0.01, 8 time steps, when f(x) = x if 0 ≤ x ≤ 1/2, f(x) = 1 - x if 1/2 ≤ x ≤ 1. Compare with the 3S-values 0.108, 0.175 for t = 0.08, x = 0.2, 0.4 obtained from the series (2 terms).