Exemplar - Verify polynomial or not II — task. Maths CBSE Mentoring, Class 9 Mentoring product.

Which one of the following is a polynomial?

$\frac{x^{2}}{2} - \frac{2}{x^{2}}$
$x^{2} + \frac{3 x^{\frac{3}{2}}}{\sqrt{x}}$
$\sqrt{2 x} - 1$
$\frac{x - 1}{x + 1}$

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