What is (8x)/(1-x^(4)) - (4x)/(x^(2) +1)...

What is `(8x)/(1-x^(4)) - (4x)/(x^(2) +1) +(x+1)/(x-1) - (x-1)/(x+1)` equal to?

A

0

B

1

C

2

D

4

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