I'm trying to revise but I can't seem to solve this:

Attachment 11329

The problem is that for 4 marks it's taken me way too long to expand and differentiate.

Is there a shortcut that I'm missing???

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- May 9th 2009, 10:23 AMRoland25Partial derivatives
I'm trying to revise but I can't seem to solve this:

Attachment 11329

The problem is that for 4 marks it's taken me way too long to expand and differentiate.

Is there a shortcut that I'm missing??? - May 9th 2009, 10:29 AMRoland25
Note, for some reason the file only opens if you click on the empty space twice

- May 9th 2009, 10:31 AMTheEmptySet