Question: In Exercises 1922, find (a) r'(t), (b) r''(t), and (c) r'(t) r''(t). r(t) = 4 cos ti + 4 sin tj

In Exercises 19–22, find (a) r'(t), (b) r''(t), and (c) r'(t) · r''(t).

r(t) = 4 cos ti + 4 sin tj

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