Ut = 12ur. Uz(0, t) = uz (r, t) = 0 u(x,0) = f(x) =1+ cos²(x) (Hint: use trig identity (double angle) to rewrite cos?(x) into cosine series form.) 0 < x < T, t > 0 t > 0 0 < ¤ < T %3D B. Solve the heat equation

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