Find the unit tangent vector T and the principal unit normal vector N. r(t) = (6t sin t + 6cos t)i + (6t cos t - 6 sin t)j - 6k
A. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j
B. T = (cos t)i + (sin t)j; N = (-sin t)i + (cos t)j
C. T = (-cos t)i - (sin t)j; N = (sin t)i + (cos t)j
D. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j
Answer: A
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A. 
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