SubArea: Properties of FunctionsLevel: BProject ID: 2000002401Accepted: 0Clonable: 0Easy: 0Find the domain of the function \( f(x) = \sqrt{ \frac{1-x}{x+1}}\).\( ( -1 , 1 ] \)\( ( -1 , 1 ) \)\( \mathbb{R} \setminus \{ -1,1\} \)\( ( -\infty , 1) \cup [ 1, \infty) \)
