原式=e^(lim(x--->0)(lncos根号下x)/x
=e^(lim(x--->0)1/(cos根号下x)*(-sin根号下x)*(1/2根号下x)
(x-->0,sin根号下x等价于根号下x)
=e^(lim(x--->0)(-1/(2cos根号下x))
=e^(-1/(2cos0))
=1/根号e
原式=e^(lim(x--->0)(lncos根号下x)/x
=e^(lim(x--->0)1/(cos根号下x)*(-sin根号下x)*(1/2根号下x)
(x-->0,sin根号下x等价于根号下x)
=e^(lim(x--->0)(-1/(2cos根号下x))
=e^(-1/(2cos0))
=1/根号e