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For which of the following, y can be a f...

For which of the following, y can be a function of x, `(x in R, y in R)`?
`{:((i) (x-h)^(2)+(y-k)^(2)=r^(2),(ii)y^(2)=4ax),((iii) x^(4)=y^(2),(iv) x^(6)=y^(3)),((v) 3y=(log x)^(2),""):}`

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The correct Answer is:
(i)not a function (ii) not a function (iii) not a function (iv) is a function (v) not a funciton
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