Question

$$\delta im_{f}(ily\frac{1}{(x+y)^{2}}-2y$$

Evaluate

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

Expand

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