$\text { Let } f ( x , y ) = x ^ { 2 } y ^ { 2 } - 1$Compute $\frac { f ( - 1,1 + k ) - f ( - 1,1 ) } { k }$ for k ≠ 0.
Enter your answer as a polynomial in k in standard form.

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The Answer of $\text { Let } f ( x , y ) = x ^ { 2 } y ^ { 2 } - 1$Compute $\frac { f ( - 1,1 + k ) - f ( - 1,1 ) } { k }$ for k ≠ 0.
Enter your answer as a polynomial in k in standard form.

Let f(x,y)=x2y2−1\text { Let } f ( x , y ) = x ^ { 2 } y ^ { 2 } - 1 Let f(x,y)=x2y2−1

$\text { Let } f ( x , y ) = x ^ { 2 } y ^ { 2 } - 1$