x-y x+y4
( —— - ——):——
x+yx-y x^2-y^2
упростите выражение
x^2 - 2xy + y^2 - x^2 + 2xy + y^2 x^2 - y^2 2y^2 x^2 - y^2 2y^2 y^2
---------------------------------------- * ----------- = ---------- * ------------ = ------- = -----
x^2 - y^2 4 x^2 - y^2 4 4 2