Find f′′(x)f''(x)f′′(x) for f(x)=lnxf(x) = \ln xf(x)=lnx.
−1/x2-1/x^2−1/x2
1/x21/x^21/x2
−2/x3-2/x^3−2/x3
1/x1/x1/x