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If x^(2) + 1 = 3x, then the value of ((x...

If `x^(2) + 1 = 3x`, then the value of `((x^(4) + x^(-2)))/((x^(2) + 5x+1))` is :

A

`2 1/3`

B

`2 1/4`

C

`4 1/2`

D

`3 1/2`

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