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If the polynomial a^(4)+ax^(3)+3x-b has ...

If the polynomial `a^(4)+ax^(3)+3x-b` has `x^(2)-1` as a factor, then

A

`a=3, b=1`

B

`a=-3, b=-1`

C

`a=3,b=-1`

D

`a=-3,b=1`

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