$\text { Find the first partial derivatives of the function } f ( x , y , z ) = 2 x ^ { 3 } + 9 x y + 3 y z - z ^ { 5 } \text {. }$

Short Answer

$\text { Find the first partial derivatives of the function } f ( x , y , z ) = 2 x ^ { 3 } + 9 x y + 3 y z - z ^ { 5 } \text {. }$