this is an easy and basic derivative question.

來源: 雲遊方丈 於 2018-11-09 04:40:14 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (1462 bytes)
回答: 題目如下 由 nanbudao 於 2018-11-04 08:33:45

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

 

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