indefinite-integration

Question: $\int_{{}}^{{}}{\frac{{{x}^{2}}-1}{{{x}^{4}}+{{x}^{2}}+1}\ dx=}$

1) $\frac{1}{2}\log \left( \frac{{{x}^{2}}+x+1}{{{x}^{2}}-x+1} \right)+c$

2) $\frac{1}{2}\log \left( \frac{{{x}^{2}}-x-1}{{{x}^{2}}+x+1} \right)+c$

3) $\log \left( \frac{{{x}^{2}}-x+1}{{{x}^{2}}+x+1} \right)+c$

4) $\frac{1}{2}\log \left( \frac{{{x}^{2}}-x+1}{{{x}^{2}}+x+1} \right)+c$

Solution:

Explanation: No Explanation

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