lim x趋近于派/2 tan-5/sec+4

分类: 作业答案 • 2022-03-06 20:10:06

问题描述：

答

lim(x->π/2) [tanx-5]/[sec+4]
=lim(x->π/2) [sinx-5cosx]/[1+4cosx]
=sin(π/2)/1
=1/1
=1