[微積] 幾個極限的題目卡住了
2 2 2 2
1. x - sin x x - sin x
lim ------ = lim ------
x→0 2 2 x→0 4
x * sin x x
↗看不懂為什麼分子不變 分母會變成這樣
Ps.這是書上例題的解答
2.
/ 2 1 \
lim | csc x - --- |
x→0 | 2 |
\ x /
2 2 0
我先將括號內合併為 x - sin x 接著一直作羅必達,卻陷入 -的循環
------- 0
2 2 就難以為繼了~"~
x * sin x
以上兩個問題,麻煩大家了。
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