यदि \(f:\mathbb{R}\to\mathbb{R}\) तथा \(f(x)=\frac{x}{1+x^2}\) है, तो (f) के बारे में सही कथन चुनिए।
If \(f:\mathbb{R}\to\mathbb{R}\) and \(f(x)=\frac{x}{1+x^2}\), choose the correct statement about (f).
Explanation opens after your attempt
A. (f) एक-एक नहीं है क्योंकि \(f(2)=f\left(\frac{1}{2}\right)\)(f) is not one-one because \(f(2)=f\left(\frac{1}{2}\right)\)
Concept
समान प्रतिबिंब खोजकर एक-एकता की जांच की जा सकती है। / Injectivity can be checked by finding repeated images.
Why this answer is correct
\(f(2)=\frac{2}{5}\) और \(f\left(\frac{1}{2}\right)=\frac{2}{5}\) है, जबकि \(2\neq \frac{1}{2}\)। / \(f(2)=\frac{2}{5}\) and \(f\left(\frac{1}{2}\right)=\frac{2}{5}\), while \(2\neq \frac{1}{2}\).
Exam Tip
भिन्न रूप देखकर तुरंत एक-एक न मानें। / Do not assume a rational expression is one-one without testing.
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