Evaluate ∫2xx2+9dx\int \frac{2x}{x^2+9} dx∫x2+92xdx.
ln(x2+9)+C\ln(x^2+9) + Cln(x2+9)+C
23arctan(x/3)+C\frac{2}{3}\arctan(x/3) + C32arctan(x/3)+C
ln∣x+3∣+C\ln|x+3| + Cln∣x+3∣+C
x2/9x^2/9x2/9