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Write the coefficient of \(x^2\) in each of the following :
i. \(\frac{\pi}{6}x+x^2 –1\)
Coefficient of \(x^2=\)
ii. \(3x – 5\)
Coefficient of \(x^2=\)
iii. \((x –1) (3x –4)\)
Coefficient of \(x^2=\)
iv. \((2x –5) (2x^2 – 3x + 1)\)
Coefficient of \(x^2=\)
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