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For the curve f(x) = x-2x, find (a) the intervals of increase and decease, (b) discuss its concavity, and (c) sketch the curve by

For the curve f(x) = x-2x, find (a) the intervals of increase and decease, (b) discuss its concavity, and (c) sketch the curve by using the information in (a) and (b). Please describe your reason. (3%, 3%, 4%)

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