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Answer :
i) The coefficient of \(x^2\) in \(2 + x^2 + x\) is \(1\).
ii) The coefficient of \(x^2\) in \(2 - x^2 + x^3\) is \(-1\).
iii) The coefficient of \(x^2\) in \(\frac{\pi{x^2}}{2} + x\) is \(\frac{\pi }{2} \).
iv) The coefficient of \(x^2\) in \(\sqrt{2}x - 1\) is \(0\).