limx->0(cosx)^(1/x)=?
问题描述:
limx->0(cosx)^(1/x)=?
答
L=lim(x->0)(cosx)^(1/x)
lnL = lim(x->0)[ln(cosx)]/x (0/0)
= lim(x->0) -sinx/cosx
=0
L =lim(x->0)(cosx)^(1/x)=1