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If x = (a + sqrt(a^(2) + b^(3)))^((1)/(3...

If `x = (a + sqrt(a^(2) + b^(3)))^((1)/(3)) + (a-sqrt(a^(2) + b^(3)))^((1)/(3))`, then what is the value of `x^(3) + 3bx - 2a` ?

A

`2a^(3)`

B

`-2a^(3)`

C

1

D

0

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