जाँच करें कि निम्नलिखित संबंधों में से...

जाँच करें कि निम्नलिखित संबंधों में से कौन फलन है :
(i)`f = {(x,y): y, x" `का वर्गमूल है जहाँ` "x in R^(+), y in R}`
(ii) `g = {(x,y): e^(y) = x,"जहाँ " x, y in R}`.
(iii) ` phi = {(x,y) : y , x " का वर्गमूल है " x, y in R^(+)}`.
(iv) ` Psi = {(x, y): e^(y) =x," जहाँ " x in R^(+) , y in R}`.

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