Lim(n→∞)2^n * sinx/(2^n)=?

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/15 03:36:16

Lim(n→∞)2^n * sinx/(2^n)=?

Lim(n→∞)2^n * sinx/(2^n)=Lim(n→∞)2^n *{[sinx/(2^n)]/[x/2^n]}*(x/2^n)
[sinx/(2^n)]/[x/2^n]趋向于1
所以等于x


因为sinx/(2^n)是一个有界函数

Lim(n→∞)2^n * sin[x/(2^n)]
=Lim(n→∞)2^n * sin[x/(2^n)]/[x/(2^n)]*[x/(2^n)]
=Lim(n→∞)2^n *[x/(2^n)]*sin[x/(2^n)]/[x/(2^n)]
=Lim(n→∞)x*Lim(n→∞)sin[x/(2^n)]/[x/(2^n)]
=x*1
=x