Consider the helix r(t) = (cos(-2t), sin(-2t), -4t). Compute, at t = 7: A. The unit tangent vector T = (-sqrt(3)/(2sqrt(5) -1/(2sqrt(5)) B. The unit normal vector N = ( C. The unit binormal vector B = ( D. The curvature = 1 1 3 -2/sqrt(5) 0

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