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Given that:

$$\frac{x^{2} + 2}{x^{3} + 1} = \frac{A}{x + 1} + \frac{Bx + C}{x^{2} - x + 1}$$

...find constants A, B and C then compute:

$$AB + BC + CA - ABC.$$

$0$

$1$

$-1$

$-2$