Уравнение \(\sqrt{f(x)} = \sqrt{g(x)}\) равносильно

• f\(x\) = g\(x\)
• f\(x\) = g\(x\); f\(x\) > 0
• |f\(x\)| = |g\(x\)|
• f\(x\) = g\(x\); g\(x\) \(\ge\) 0