यदि \(f:\mathbb{R}\to\mathbb{R}\) तथा \(f(x)=\frac{x}{1+x^2}\) हो तो (f) एकैकी है या नहीं?
If \(f:\mathbb{R}\to\mathbb{R}\) and \(f(x)=\frac{x}{1+x^2}\), is (f) one-one?
Explanation opens after your attempt
A. नहींNo
Concept
एकैकी नहीं दिखाने के लिए दो अलग आगतों पर समान मान खोजें। / To show that a function is not one-one, find two different inputs with the same output.
Why this answer is correct
\(f(2)=\frac{2}{5}\) और \(f\left(\frac{1}{2}\right)=\frac{\frac{1}{2}}{1+\frac{1}{4}}=\frac{2}{5}\), जबकि \(2\neq\frac{1}{2}\)। / \(f(2)=\frac{2}{5}\) and \(f\left(\frac{1}{2}\right)=\frac{\frac{1}{2}}{1+\frac{1}{4}}=\frac{2}{5}\), while \(2\neq\frac{1}{2}\).
Exam Tip
भिन्न वाले फलनों में उल्टे युग्म अक्सर समान मान दे सकते हैं। / In fractional functions, reciprocal pairs can often give the same value.
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