The power rule and the chains rule

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Homework Statement



How do I know for sure when to use the power rule instead of the chain rule and vice versa?

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The Attempt at a Solution

 
on Phys.org
power rule is used when there are no variables in the raised part (ie. x^2 or 3x^6) but chain rule is used if there are variables in the raised part (ie. d/dx (e^(2x))=e^(2x) * d/dx (2x) = 2e^(2x) Chain rule is used in other situations but this is basically the situation where you would have to decide between chain and power rule as you are asking.