So I got this classic implicit differentiation problem y=x^x I've tried to tackle it by transforming x^x to the equivalent form of e^((lnx)x): y=xx y=(e^(lnx))^x y=e^((lnx)x) and then proceeded to differentiate it in the following way: y′=e:((lnx)x) x lnx x 1/x

tuanazado

tuanazado

Open question

2022-08-16

So I got this classic implicit differentiation problem y = x x
I've tried to tackle it by transforming x x to the equivalent form of e ( ln x ) x :
y = x x
y = ( e ln x ) x
y = e ( ln x ) x
and then proceeded to differentiate it in the following way:
y = e ( ln x ) x ln x 1 x

Answer & Explanation

Isabella Rocha

Isabella Rocha

Beginner2022-08-17Added 10 answers

y = x x = e x ln x d y d x = x x ( ln x + 1 )
By the chain rule and the product rule, which is where you went wrong.
sondestiny120g

sondestiny120g

Beginner2022-08-18Added 2 answers

The last two multiplication terms in your expression for y are wrong.
We calculate (I use log notation instead of ln):
( e x log x ) = e x log x ( x log x ) = e x log x ( 1 log x + x 1 x ) = e x log x ( log x + 1 )
In the third equality I used the product differentiation rule ( u v ) = u v + v u

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