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Find T, N, and for the plane curves in Exercises 1-4. 1. r(t) = ti+ (In cos t)j, -/2 < 1 < /2 2.

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Find T, N, and for the plane curves in Exercises 1-4. 1. r(t) = ti+ (In cos t)j, -/2 < 1 < /2 2. r(t) = (In sec t)i + tj, -/2

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