List of top Mathematics Questions on Functions asked in Assam CEE

The range of the function \[ f:\mathbb{R}-\{-1,1\}\to\mathbb{R}, \qquad f(x)=\frac{x^2}{1-x^2} \] is

If \(f\) is a subset of \(Z\times Z\), then which of the following is a function from \(Z\) to \(Z\)?