Let r(t) = (t², 1 – t, 4t). Calculate the derivative of r(t) · a(t) at t = 8, assuming that a(8) = (5, –1, –6) and a'(8) = (5, 4, 1) d r(t) · a(t)|t=8 = dt

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A: Explanation:

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Q: Then the derivative of

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