I need to find the relative max and min, but I'm having a little trouble finding the derivative. Do I use the log rule then the power rule? y=(ln3x)^2
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Originally Posted by hotblonde I need to find the relative max and min, but I'm having a little trouble finding the derivative. Do I use the log rule then the power rule? y=(ln3x)^2 Use the chain rule. Spoiler: Let $\displaystyle u = \ln (3x) \Rightarrow \frac{du}{dx} = \frac{1}{x}$ and $\displaystyle y = u^2$. Spoiler: Then $\displaystyle \frac{dy}{dx} = \frac{dy}{du} \cdot \frac{du}{dx}$. Spoiler: Then substitute back that $\displaystyle u = \ln (3x)$. Spoiler: Tut tut. You have to do at least some of the work, you know.
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