Posted by **Lucy X** on Sunday, November 29, 2009 at 3:58am.

Okay, I want to find the derivative of (x^x)^(x^x)...

Well, I already went through the process of finding the derivative of just x^x (I used ln to do this).

This is what I found...

dy/dx = x^x(lnx+1)

So now I want to find the derivative of (x^x)^(x^x) (using ln).

This is what I did...

y = (x^x)^(x^x)

lny = x^xlnx^x

(1/y)(dy/dx) = (d/dx)(x^x)ln(x^x) + (d/dx)ln(x)^x*(x^x)

Yeah, I don't know if it is right.

Also, how do I find the derivative of ln(x)^x?

It seems simple enough, but I don't know...

- Calculus - derivatives -
**MathMate**, Sunday, November 29, 2009 at 9:03am
let u=x^{x}

ln(u) = x ln(x)

(1/u)du/dx = ln(x) + 1

du/dx = u (ln(x) + 1)

du/dx = x^{x}(ln(x) + 1)

So this confirms what you've got for

d(x^{x})/dx

To find (x^x)^(x^x), it is not as complicated as it looks once we've got the derivative of x^{x}.

I would start with

u=x^{x} and

du/dx = x^{x}(ln(x) + 1)

Given

y=(x^x)^(x^x)

substitute

u=x^{x}, then

y=u^{u}

ln(y)=u ln(u)

dy/du=u^{u}(ln(u)+1)

dy/dx

=dy/du.du/dx

=u^{u}(ln(u)+1) . x^{x}(ln(x) + 1)

The rest is algebra to eliminate u from the right hand side to get

x^x^x^x(x^{x+1} ln(x)(ln(x)+1)+x^{x}(ln(x)+1))

or in any other equivalent form that you wish.

## Answer this Question

## Related Questions

- Derivative - Can you help me find the derivative of y= cos(x)/1+sin(x).. the / ...
- calculus - Differentiate both sides of the double angle identify sin 2x= 2 sin x...
- calculus - Hello. I need help finding the open intervals of this equation: f(x)=...
- calculus - Hello. I need help finding the open intervals of this equation: f(x)=...
- Calculus derivatives - f(a) = a + √a (a) Find the derivative of the ...
- Calculus - 1.) Find the derivative of tan (sec x). 2.) Find the derivative if 1/...
- Applied Calculus - Find the first and second derivative of the function: x/(7x+...
- Calculus (Derivatives) - What is the derivative of the this functon? g(x) = -500...
- Calculus (Help) - Also I would like to know how to set this problem up in ...
- calculus - find the second derivative of F(x)=3e^-2x(^2) to find the inflection ...