Mathc initiation/a00a2

Sommaire

Calculons la dérivée :

                  
          y    = ln(x)
          
       e**y    = e**(ln(x)) 
       
       e**y    =  x       
       
      (e**y)'  = (x)' 
       
      e**y y'  =  1        
       
           y'  =  1/e**y                           y = ln(x)
                                                       
           y'  =  1/e**(ln(x))            e**(ln(x)) = x
                                             
           y'  =  1/x