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Derivative of ln(ln x) 
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#1
Mar512, 07:48 AM

P: 1

1. The problem statement, all variables and given/known data
Differentiate $$ln(lnx)$$ 2. Relevant equations 3. The attempt at a solution My solution: Let $f(x)=lnx$, since${d/dx}ln f(x)={f'(x)/f(x)}$, ${d/dx}ln(lnx)={{1/x}/lnx}/times {1/x} ={1/x^2lnx}$. 


#3
Mar512, 09:45 AM

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Surround your LaTeX code with either ## or $$. A single $ doesn't work. This is deliberate, because it would have confused people who don't use LaTeX but write stuff about money. LaTeX guide for the forum.



#4
Mar512, 12:31 PM

Math
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Thanks
PF Gold
P: 39,497

Derivative of ln(ln x)
##e^x##
$$x^n$$ [itex]\int f(x)dx[/itex] [tex]\frac{df}{dx}[/tex] Wow! All this time I have been using "itex" and "tex"! 


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