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Calculate ∂2f∂y2\frac { \partial ^ { 2 } f } { \partial y ^ { 2 } }

Question 64

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Calculate ∂2f∂y2\frac { \partial ^ { 2 } f } { \partial y ^ { 2 } } , ∂2f∂xy\frac { \partial ^ { 2 } f } { \partial x y } and evaluate each at (8,8)( 8,8 ) .
​ f(x,y)=1,070−20x+11y+9xyf ( x , y ) = 1,070 - 20 x + 11 y + 9 x y ​
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