AMaths Qn

• blue smurf

  1 Apr 11, 08:24

  How to do this A math q:

  Find an expression f(x) such that

  d/dx [ f(x)] =  1 / xlnx

   

• wee_ws

  1 Apr 11, 08:39

  Hi,

    Notice that 1 / (x ln x) may be rewritten as (1 / x) / (ln x).

    Then recall that the derivative of ln f(x) is f'(x) / f(x).

    Thanks.

  Cheers,
  Wen Shih