I don't even know where to start this one. I can do all the other problems in the section, but this one makes no sense
Answers and Replies
a). since you've done the other problems, you surely saw some gradients and divergences. The easiest way to do this is piece by piece. First take the gradient of f to get a vector field. Then simply apply div to this vector field to get the answer.
once you get this you will see the answer for part b
um just do what it says? what part are you having trouble with?
I agree with ice109- if the problem asks you to find "div grad f", I would recommend that you first find the grad of f and then the div of that! I am assuming that, since you were given a problem like this, you know what "div" and "grad" are.