Calculate $\frac { \partial f } { \partial x }$ , And

Calculate $\frac { \partial f } { \partial x }$ , and $\frac { \partial f } { \partial y }$ when defined. $f ( x , y ) = 6 x ^ { 3 } - y ^ { 3 } + x - 12$

A) $\frac { \partial f } { \partial x } = 18 x ^ { 2 } + 1 - 3 y ^ { 2 }$ , $\frac { \partial f } { \partial y } = 18 x ^ { 2 } + 1$
B) $\frac { \partial f } { \partial x } = 18 x ^ { 2 } + 1$ , $\frac { \partial f } { \partial y } = - 3 y ^ { 2 }$
C) $\frac { \partial f } { \partial x } = - 3 y ^ { 2 }$ , $\frac { \partial f } { \partial y } = 18 x ^ { 2 } + 1$
D) $\frac { \partial f } { \partial x } = 6 x ^ { 2 } + 1$ , $\frac { \partial f } { \partial y } = - 3 y ^ { 2 }$
E) $\frac { \partial f } { \partial x } = 6 x ^ { 2 }$ , $\frac { \partial f } { \partial y } = y ^ { 2 }$

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