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If d/dx ((1+x^2 + x^4)/(1+x+x^2)) = ax +...

If `d/dx ((1+x^2 + x^4)/(1+x+x^2))` = ax + b , then the values of a and b are

A

`-2,1`

B

1,-2

C

`2,-1`

D

`-1,2`

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