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If g(x)=x^(2)+x-2 and 1/2 gof (x)=2x^(2)...

If `g(x)=x^(2)+x-2` and `1/2 gof (x)=2x^(2)-5x+2`, then which is `f(x)`

A

2x - 3

B

2x + 3

C

2 + 2x

D

`2x^(2)-3x-1`

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A
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