Calculate $\frac { \partial ^ { 2 } f } { \partial y ^ { 2 } }$

Short Answer

Calculate $\frac { \partial ^ { 2 } f } { \partial y ^ { 2 } }$ , $\frac { \partial ^ { 2 } f } { \partial x y }$ and evaluate each at $( 8,8 )$ .
​ $f ( x , y ) = 1,070 - 20 x + 11 y + 9 x y$ ​
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