Cracking my brain on how to do this. Is there any 1 out there who can solve this monster?!
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here is an example to get you started $\displaystyle \displaystyle \frac{\partial TR}{\partial x_3} = 2\frac{x_1x_3}{x_2} + \frac{x_2}{x_2x_3} = 2\frac{x_1x_3}{x_2} + \frac{1}{x_3} $ You finish, post if you get stuck
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