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解微積分2題(2)
2007-10-03 8:37 am
回答 (1)
2007-10-03 10:05 am
✔ 最佳答案
(2)lim(y->0) (sin3y cot5y) / (y cot4y)
=lim(y->0) (sin3y cos5y sin4y) / (y cos4y)(sin 5y)
=lim(y->0) [(3sin3y/3y) cos5y (4sin4y/y)] / [(cos4y)(5sin 5y/5y)]
=[(3) (1) (4)] / [(1)(5)]
=12/5
(4)
for g is continuous
g(-2+) = g(-2-)
-2 = b (-2*-2)
b= - 1 / 2
收錄日期: 2021-04-23 17:16:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071003000051KK00136