v = a(R - r)r^2 i need some help on finding the derivative...a is a constant
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Originally Posted by mer1988 v = a(R - r)r^2 i need some help on finding the derivative...a is a constant multiply out: $\displaystyle v = a(R - r)r^2$ $\displaystyle \Rightarrow v = aRr^2 - ar^3$ now use the power rule
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