Question: Question 9 Let r(t) be a space curve with r' (t) 0, and T, N, B be the unit tangent vector, principal unit normal vector,

Question 9 Let r(t) be a space curve with r' (t) 0, and T, N, B be the unit tangent vector, principal unit normal vector, and binormal vector respectively. Which of the following is/are correct? P. B . B = 0 Q. T . (T + N +B) =1 R. T X (T + N) =-B O P and Q O Q and R O Q only O P and R O R only

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