Hello, everyone. It's been awhile since I've visited the boards. I hope all is well for you and yours.

The problem I'm dealing with is as follows:

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Find the indicated partial derivative:

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I'm just wondering if anyone can help explain the problem to me as I'm having trouble getting started. I don't really know where to find a thread. Any tips or hints would be appreciated. I guess the partial derivative it's asking for is the third parital derivative with respect to u, v, and w?

Thanks in advance for your consideration,

-Austin