stion 7 of 9 Two spacecraft are following paths in space given by r1 = ( sin(t), t, t2 ) and r2 = ( cos(t), 1 - t, 13 ). If the temperature for the points is given by T(x, y, z) = x y(9 - z), use the Chain Rule to determine the rate of change of the difference D in the temperatures the two spacecraft experience at time t = 2. (Use decimal notation. Give your answer to two decimal places.)