The value of the integral `int(1+x^(2))/(1+x^(4))dx` is equal to

The value of the integral `int(1+x^(2))/(1+x^(4))dx` is equal to
A. `tan^(-1)x^(2)+C`
B. `(1)/(sqrt(2))tan^(-1)((x^(2)-1)/(sqrt(2)x))`
C. `(1)/(2sqrt(2))log((x^(2)+sqrt(2)x+1)/(x^(2)-sqrt(2)x+1))+C`
D. none of these

The value of the integral `int(1+x^(2))/(1+x^(4))dx` is equal to

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