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lim x趋近于派/2 tan-5/sec+4
人气:351 ℃ 时间:2020-02-03 09:26:31
解答
lim(x->π/2) [tanx-5]/[sec+4]
=lim(x->π/2) [sinx-5cosx]/[1+4cosx]
=sin(π/2)/1
=1/1
=1
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