Recall from Lecture the fourth-order Runge-Kutta method:
k1 = hf(r,u,t)
k2 = hf(r+0.5k1,u+0.5k1,t+0.5h)
k3 = hf(r+0.5k2,u+0.5k2,t+0.5h)
k4 = hf(r+k3,u+k3,t+h)
Δu = (k1 + 2k2 + 2k3 + k4)/6
u = u + Δu
Apply with t0 the Initial value problem from the previous question to find a better approximation to √2 (recall √2 ≈ 1.41421). Provide a numeric answer rounded to five decimal places.