$$x^{2}+2x^{3}y+3x^{2}y+3x^{2}y+y^{3}+y^{3}+x^{3}; 4x^{3}+3x^{2}y+6xy^{2}+4y^{3}$$
$\frac{1}{x^{2}+y^{3}+5yx^{2}}$
$-\frac{2x\left(5y+1\right)}{\left(x^{2}+y^{3}+5yx^{2}\right)^{2}}$
