π2258 π84 π48 π288

$\alwaysar{\frac{1}{x + y}}$ -1 س + ص 1

$\alwaysar{(-1 \ , \ 1)}$ $\alwaysar{(0 \ , \ 1)}$ $\alwaysar{(1 \ , \ 1)}$ $\alwaysar{(1 \ , \ -1)}$