y=Inx/x,
dy=d(lnx)/x+lnx*d(1/x)
=(1/x^2-lnx/x^2)dx.
y=x^3（2x-1）^10
dy=d(x^3)*(2x-1)^10+x^3*d[(2x-1)^10]
=[3x^2*(2x-1)^10+20x^3*(2x-1)^9]dx.