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1.Which of the following expressions are...

1.Which of the following expressions are polynomials in one variable and which are not State reasons for your answer.
(i) `4x^2-3x+7` , (ii)`y^2+sqrt2`
(iii) `3sqrtt -3t`, (iv) `y+2/y` , (v) `x^16+y^5+t^50`

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