An observer moves so that his position, velocity, and acceleration at time t are given by the formulas r(t) = x(1)i+ y(1)j+¿(1) k, v(1) = dr/dt, and a(t) = dv/dt. If the temperature in the vicinity of the observer depends only on position, T = T(x, y, z), express the second time derivative of temperature as measured by the observer in terms of D, and Da. %3D %3D

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