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Finding Partial Derivatives

Please see the attached file for the fully formatted problems.
Given * :
From *, it is known that:
and .

I know that the solutions of the following derivatives are these:

Show each step to get to the given solutions of 1), 2), and 3).


Solution Summary

Partial derivatives are found. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.