x or x^3 over (x^2 + a)(x^2 + b): substitute t = x^2, then partial fractions

1. A.
   $\frac{1}{3}\log\left( \frac{\left( x^{2} + 4 \right)^{2}}{\sqrt{x^{2} + 1}} \right) + c$, where c is the constant of integration
2. B.
   $\ \log\left( \frac{\left( x^{2} + 4 \right)^{2}}{\sqrt{x^{2} + 1}} \right) + c$, where c is the constant of integration
3. C.
   $\ 3\log\left( \frac{\left( x^{2} + 4 \right)^{2}}{\sqrt{x^{2} + 1}} \right) + c$, where c is the constant of integration
4. D.
   $\ \frac{2}{3}\log\left( \frac{\left( x^{2} + 4 \right)^{2}}{\sqrt{x^{2} + 1}} \right) + c$, where c is the constant of integration

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1. A.
   $\dfrac{1}{5}\log(2)$
2. B.
   $\dfrac{1}{10}\log(2)$
3. C.
   $-\dfrac{1}{5}\log(2)$
4. D.
   $-\dfrac{1}{10}\log(2)$

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