0\\ x-1 \geq 0\\x\neq 0\\ \end{matrix}\right. \ \Leftrightarrow \ \left\{\begin{matrix} (1-x)(1+x)\geq 0 \\ x>-1\\ x \geq 1\\x\neq 0\\ \end{matrix}\right. \ \Leftrightarrow \ \left\{\begin{matrix} x \in [-1;1] \\x \geq 1\\\end{matrix}\right. \ \Leftrightarrow \ x =1 \\ \\ OTBET: \ D(y)=\{1\}" alt="\left\{\begin{matrix} 1-x^2\geq 0 \\ x+1>0\\ x-1 \geq 0\\x\neq 0\\ \end{matrix}\right. \ \Leftrightarrow \ \left\{\begin{matrix} (1-x)(1+x)\geq 0 \\ x>-1\\ x \geq 1\\x\neq 0\\ \end{matrix}\right. \ \Leftrightarrow \ \left\{\begin{matrix} x \in [-1;1] \\x \geq 1\\\end{matrix}\right. \ \Leftrightarrow \ x =1 \\ \\ OTBET: \ D(y)=\{1\}" align="absmiddle" class="latex-formula">