4 . A critical point of a function of ( * ) i s a point where its derivative is zero . A critical point can be a mini mum or a maximum ,

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4 . A critical point of a function of ( * ) i s a point where its derivative is zero . A critical point can be a minimum or a maximum , distinguished by the sign of the curvature of the function d' f ( x ) dy ? or a point ofinflection . Find and classify the critical points for ( x ) = 2 14 - 212