निम्नलिखित में से प्रत्येक में x^(2) का ...

निम्नलिखित में से प्रत्येक में `x^(2)` का गुणांक लिखिए :
(i) `2+x^(2)+x` (ii) `2-x^(2)+x^(3)`
(iii) `(pi)/(2)x^(2)+x` (iv) `sqrt(2)x-1`

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