Lim(x-sinx)/xln(1+x^2)x趨近於0

Lim(x-sinx)/xln(1+x^2)x趨近於0

Lim(x→0)(x-sinx)/xln(1+x^2)
=Lim(x→0)(x-sinx)/x^3(0/0)
=Lim(x→0)(1-cosx)/(3x^2)
=Lim(x→0)(x^2/2)/(3x^2)
=1/6