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

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

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