Let f(x)= x x+1 , x ≠ –1, then for what value of α is f ( f ( x )) = x ?
Mathematics · JEE Advanced · NTA Exams — Sets, Relations and Functions
Let \(f(x)=\frac{\alpha x}{x+1}\), x ≠ –1, then for what value of α is
f (f (x)) = x ?
f (f (x)) = x ?


- 1
- –1
Answer
(D) –1
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