3) The temperature at a point (x, y, z) is T(x,y,=)=10=³e z are measured in meters. Be sure to give appropriate units in answers. degrees Celsius where x, y and (a) Find the rate of change of the temperature at (1,2,1) in the direction toward (4,3,2). (b) A bug at (1,2,1) wants to fly in the direction in which the temperature increases most rapidly. In what direction should the bug travel? What is the rate of increase in that direction? (units)