求lim(n->0){(sin(n/2))/n},

问题描述:

求lim(n->0){(sin(n/2))/n},

用洛必达法则,上下求导
lim(n->0){(sin(n/2))/n}
=lim(n->0){(1/2)cos(n/2))/1}
=1/2