Question

помогите
Найдите D(f) f(x) x/x^2-4

Answer 1

$f(x)=\frac{x}{x^2-4}\\\\OOF:\; \; x^2-4\ne 0\quad \to \quad (x-2)(x+2)\ne 0\; ,\\\\x\ne 2\; ,\; \; x\ne -2\\\\D(f)=(-\infty ,-2)\cup(-2,2)\cup (2,+\infty )$