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likearollings

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## Homework Statement

http://img267.imageshack.us/img267/5496/16943970.jpg [Broken]

Could anybody here tell me what this question is asking?

I have tried differentiating with respect to y and keeping x and z constant but i got the asnwer wrong. The topic of this assignment is 'review of differentiaion' so im assuming its something to do with differentiation.

If any body is familiar with maple TA, is it a glitch or something?

What does f subscript zx mean?

thanks in advance

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