Помогите упростить выражение:
1)(1/ x-y - 1/ x+y) · x²-y²/ y²
2)(1/ x²+1/ y²+1/ x+y · 2x+2y/ xy) · x²y²/ x²-y²

1)(1/х-у-1/х+у)*((х^2-у^2)/у^2)=(х+у-х+у)/(х-у)(х+у)*((х^2-у^2)/у^2)) = 2у/(х^2-у^2)*((х^2-у^2)/у^2))=2/у;

х+у-х+у=-------------×(х-у)(х+у)/у^2=(х-у)(х+у) 2у=-------=2/у у^2₩₩₩₩₩₩₩=(1/х^2+1/у^2 + 1×2(х+у)+--------------)×х^2у^2/х^2-у^2= (х+у)×ху=(1/х^2+1/у^2+2/ху)×х^2у^2/х^2-у^2= у^2+х^2+2ху=---------------------- ×х^2у^2/(х-у)(х+у)= х^2у^2 (х+у)^2=-----------------=(х+у)/(х-у)(х-у)(х+у)