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

What is `int (x^(4) -1)/(x^(2) sqrt(x^(4) + x^(2) + 1)) dx` equal to ?
A. `(x)/(sqrt(x^(4)+x^(2)+1))+C`
B. `(sqrt(x^(4)+x^(2)+1))/(x)+C`
C. `(2x)/(sqrt(x^(4)+x^(2)+1))+C`
D. `(sqrt(x^(4)+x^(2)+1))/(2x)+C`

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

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