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The derivative of a function is f'(x)=-6x^2(x-1)(x+2). How can I identify any local extrema of f,...

The derivative of a function is f'(x)=-6x^2(x-1)(x+2). How can I identify any local extrema of f, if any? How can use the First Derivative test to determine if any of the local extreme identified are a relative maximum or a relative minimum?

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