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answer both questions Thinking [14 marks] 19. Use the first or second derivative test (or both) to find the local maximum or minimum points of

answer both questions

Thinking [14 marks] 19. Use the first or second derivative test (or both) to find the local maximum or minimum points of f(x) = x* - 8x3 + 18x2 [4 marks] the workmay 20. Determine the points of inflection of f (x) = 243 [4 marks]

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