早教吧 育儿知识 作业答案 考试题库 百科 知识分享

Limn趋向正无穷(sin1/n+cos1/n)^n,

题目详情
Lim n趋向正无穷 (sin 1/n+cos 1/n)^n,
▼优质解答
答案和解析
lim (n→∞) (sin1/n+cos1/n)^n
=lim (n→∞) (1+2sin1/ncos1/n)^(n/2)
=lim (n→∞) (1+sin2/n)^(n/2) x→∞时,sinx~x
=lim (n→∞) (1+2/n)^(n/2) x→∞时,(1+1/x)^x=e
=e