Question: In Exercises 19 and 20, find (a) r'(t), (b) r''(t), and (c) r'(t) r''(t). r(t) = (t 2 + 4t) i - 3t 2

In Exercises 19 and 20, find (a) r'(t), (b) r''(t), and (c) r'(t) ยท r''(t).

r(t) = (t2 + 4t) i - 3t2j

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