MATHHHHHHHHH

👨🏻‍🏫 學術台數學

Xxx

2012-03-17 7:57 am

圖片參考：http://imgcld.yimg.com/8/n/HA00679604/o/701203160088213873449730.jpg

但如果我咁計:
Y=COTX DY/DX=-CSC^2X~~~~~~~~咁答案未唔同

更新1:

(tanx)^-1=/=tan^-1x???

回答 (1)

myisland8132

2012-03-17 8:38 am

✔ 最佳答案

Your concept is not correct

y = tan ^(-1) x means the per-image of tan x

For example, if x is 1, then y = π/4

On the other hand, y = cot x = 1/tanx

For example, if x is π/3, then y = √3

So, tan ^(-1) x =/= cot x

For typing, tan ^(-1) x is often written as arctanx

Hope this explaination will help.

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