Question

无穷小代换,帮看看哪一步错了x→0lim[(sinx)sin(1-cos)^2]/(x^4+x^5)=sin(1-cos

Answer 1

最后

=sin(x^4/4)/(x^3+x^4)

=(x^4/4)/(x^3+x^4)

=x/[4(1+x)]

所以=0