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I understand that we use the chain rule to differentiate the $y$ part of it. Like if it stood $xy$, I would use the product rule, that say that the derivative of $y$ is $dy/dx$. But what if it's just $y$ alone or with a constant in front off it?

Thank you!

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    $\frac{\mathrm{d}}{\mathrm{d}x}(c\cdot f(x))=c\frac{\mathrm{d}}{\mathrm{d}x}f(x)$ if $c$ is a constant.2010-11-07
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    Thanks, if you put that in a reply I can check it off.2010-11-07

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