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The temperature T in a metal ball is inversely proportional to the distance from the center...

The temperature T in a metal ball is inversely proportional to the distance from the center of the ball, which we take to be the origin. The temperature at the point (1, 2, 2) is 120°.

(a) Find the rate of change of T at (1, 2, 2) in the direction toward the point (3, 3, 4).

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