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Partial Derivatives Kindly check my answer

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It’s a little messy and I don’t understand what you did. But here is how I would do it.

dm/dz= (treat like a constant)* dm/dz(1/z^2), I think you can calculate that

To find dm/dxdz, tit then take dm/dx of that answer.
Treating all non-x-variables as a constant.

I get
Constant* -2/z^3

(Product rule)
Then for dm/dxdz=
-2/z^3 * (cos(xy)/y + x*y(-sin(xy)/y)  )
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You can check your partial derivatives using Wolfram Alpha.

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