微积分算数lim(x)(sin-1/x)=?x趋近于无穷

Question

微积分算数
lim (x)(sin-1/x)=?x趋近于无穷

Answer 1

lim sin(-1/x)/ (1/x)
=lim [cos(-1/x) (x^(-2))] / [-x^(-2)]
=-1