(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

I follow the steps until I get to 2(x+y+z)(1 - sin(r+s) + cos(r+s))

The actual derivation process isn't the problem, I get lost in trying to figure out when to plug values forrands.

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# Homework Help: Finding specified partial derivatives

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