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I needs math help.

werto165
By werto165
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25575725b6.png

 

Is there a quick method of doing this? I know it's the partial derivatives just the very last one is rather annoying to do a second partial derivative. Is the first partial derivative of the last one 

 

x/(x^2+y^2)(ln(x^2+y^2)^1/2)? 

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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I think it's f

It's h, I don't really know why, I only have the answers, this isn't a past paper, the papers so far had easier questions. 

CPU: Intel 3570 GPUs: Nvidia GTX 660Ti Case: Fractal design Define R4  Storage: 1TB WD Caviar Black & 240GB Hyper X 3k SSD Sound: Custom One Pros Keyboard: Ducky Shine 4 Mouse: Logitech G500

 

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