[微分] 絕對值函數遞增遞減
Find the interval of the function where it is increasing and decreasing
f(x)=|x^2-1|
解答是:
(-∞,-1),(0,1)遞減
(-1,0),(1,∞)遞增
我想問的是
f'(x) = |2x|
為什麼還要考慮1,-1?
遞增遞減不是考慮一階導數=0的地方就好了?
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 125.224.167.53
→
02/12 14:42, , 1F
02/12 14:42, 1F
→
02/12 14:43, , 2F
02/12 14:43, 2F
討論串 (同標題文章)