User:G01den W01f01/sandbox

$$|x| = \begin{cases} x^2, & \mbox{if } x\neq 0 \\ 1, & \mbox{if } x=0 \end{cases} $$

$$f(x) = x^2$$

$$f(x) = x^2, x\neq 2 $$

$$f(x) = \begin{cases} x^2, & \mbox{if } x\neq 2 \\ 1, & \mbox{if } x = 2 \end{cases} $$