Let https://webwork.uncc.edu/webwork2_fi...b673817f81.png where

https://webwork.uncc.edu/webwork2_fi...57ec26ce11.png

https://webwork.uncc.edu/webwork2_fi...f1652843b1.png

https://webwork.uncc.edu/webwork2_fi...bae1b63c31.png

https://webwork.uncc.edu/webwork2_fi...40e3095781.png?????? https://webwork.uncc.edu/webwork2_fi...605b6f2681.png ??????

Guys, i have this problem from Partial Derivatives chapter-Chain Rule. I don't how to get started in this problem. plz guide me.