Given the function f(x,y)=x4y3−5xy2f(x,y) = x^4 y^3 - 5xy^2f(x,y)=x4y3−5xy2, calculate the third-order partial derivative fxxyf_{xxy}fxxy.
36x2y2−536x^2 y^2 - 536x2y2−5
36x2y236x^2 y^236x2y2
12x2y3−10y12x^2 y^3 - 10y12x2y3−10y
36xy236x y^236xy2