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Consider the following function. R(x ) = x4-16x3+ 72x2 + 8 (a) Make a sign diagram for the first derivative. --Select-v -Select--v -Select-.v Select-- v Select- X X (b) Make a sign diagram for the second derivative. -Select-v -Select-.. -Select-. v -Select--. v --Select-- v X = X = (c) Sketch the graph, showing all relative extreme points and inflection points. V