f `(x)=(y^3)*(arcsin(x/y))`_(x)=y^3*(1/sqrt(1-x^2y^2))*(x/y)`_(x)=
=y^2/sqrt(1-x^2/y^2);
f `_(y)=(y^3)`_(y)*(arcsin(x/y))+ y^3*((arcsin(x/y))`_(y)=
=3y^2*(arcsin(x/y)) + y^3*(*(1/sqrt(1-(x^2/y^2))*(x/y)`_(y)=
=3y^2*(arcsin(x/y)) + y^3*(*(1/sqrt(1-(x^2/y^2))*(x/-y^2)=
=3y^2*(arcsin(x/y))-(xy/sqrt(1-x^2y^2))
y`_(x)=(lnx)`_(x)+(∛x)`_(x)= (1/x)+(1/3)*x^(-2/3)=(1/x) +(1/(3∛(x^2)))
и подставить все в формулу ( см. приложение)