Sketch the graph of r(t) = (t, t 3 ). Since r'(t) = (1, 3t 2 ),
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Sketch the graph of r(t) = (t, t3). Since r'(t) = (1, 3t2), the unit normal N(t) points in one of the two directions ± (−3t2, 1). Which sign is correct at t = 1? Which is correct at t = −1?
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