Kirk's grandparents are really enjoying their portable music players and have downloaded many more albums. Maude now has 225 alb
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Notice that you have a difference of cubes:
which can be factored using the rule,
So,
and just to make things look nicer, we can pull out 1/6 from the first factor and 1/36 from the second to get
The derivative of in the direction of a vector
is
With , we get
and ,
Then