Помогите упростить выражение: 1)(1/ x-y - 1/ x+y) · x²-y²/ y² 2)(1/ x²+1/ y²+1/ x+y ·...

Решите задачу:

$1) ( \frac{1}{x-y} - \frac{1}{x+y} )* \frac{x^2-y^2}{y^2} = \\ \\ =( \frac{1}{x-y} - \frac{1}{x+y} )* \frac{(x+y)*(x-y)}{y^2} = \\ \\ = \frac{(x+y)*(x-y)}{(x-y)y^2}-\frac{(x+y)*(x-y)}{(x+y)y^2}= \\ \\ =\frac{x+y}{y^2} - \frac{x-y}{y^2}= \\ \\ = \frac{2y}{y^2} = \frac{2}{y}$