f(x)=(lnx^2)^3f'(x)=3(lnx^2)^2*(lnx^2)'*(x^2)'=3(lnx^2)^2*(1/x^2)*(2x)=6(lnx^2)^2/x
3[(Inx^2)^2][1/x^2]2x=6x[1/x^2][(Inx^2)^2]
