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Q18) Let u(x) = 2x2 and f (x) = [u(x)]3 = 8x6. Which of the following...

Q18) Let u(x) = 2x2 and f (x) = [u(x)]3 = 8x6. Which of the following is f ´(x)?

(a) 3[u(x)]2 (b) 3[u´(x)]2 (c) 3[u(x)]2u´(x)

Q19) Find the slope of the tangent to the graph of f (x) = x 2 – 3x at x = 0, x = 2, and x = 3.

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