Find the maximum value of the function

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So I was just messing around with finding the maximum and minimum values of functions, and I came across this:

$$ \text{Find the maximum value of} \,\, f(x)=\frac1{x^{2x^2}}.$$

Any ideas?

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Hint. Assume $x>0$. Then you get $$ f'(x)=\frac{-2x\times (1+2 \ln x)}{x^{2 x^2}} . $$ Can you take it from here?