What is ∫1x dx\displaystyle\int \frac{1}{x}\, dx∫x1dx for x>0x > 0x>0?
lnx+C\ln x + Clnx+C
−x−2+C-x^{-2} + C−x−2+C
1x2+C\dfrac{1}{x^2} + Cx21+C
xlnx+Cx \ln x + Cxlnx+C