Consider the following.

$f(x,y)=x^{6}y-4x^3{y}^2$

Find the first partial derivatives.

$f_x(x,y)=$

$f_y(x,y)=$

$$

Find all the second partial derivatives.

$f_{}(x,y)=$

$f_{xy}(x,y)=$

$f_{yx}(x,y)=$

$f_{yy}(x,y)=$