this is an easy and basic derivative question.

來源: 於 2018-11-09 04:40:14 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

This is an easy and basic derivative question.

 

 

 

k'(x) =((f(x))^-1)'

= -(f(x))^-2*f'(x)

 

so:

k'(2)= - (f(2))^-2          *        f'(2)

=-4^-2   *   (4.3-4)/(2.1-2)

= -9/16