Which of the following is equivalent to ∫xx2+4dx\int \frac{x}{\sqrt{x^2+4}} dx∫x2+4xdx?
x2+4+C\sqrt{x^2+4} + Cx2+4+C
12x2+4+C\frac{1}{2}\sqrt{x^2+4} + C21x2+4+C
2x2+4+C2\sqrt{x^2+4} + C2x2+4+C
ln∣x2+4∣+C\ln|\sqrt{x^2+4}| + Cln∣x2+4∣+C