Câu hỏi 4 Chưa trả lời Đạt điểm 1,50 P Đặt cờ Let the curve (C) with the equation R(t) =<4cos(t), 4sin(t), 5t>. Find the curvature of (C) at a) any point M(t). b) the point M(t) when t=0. Solution a) R' (t) =< R" (t) =< ⇒ R' (t) x R" (t) =< ⇒ ||R' (t) × R" (t)|| = ||R' (t) || = The curvature at the point M(t) on (C): k(t) = ||R' (t) x R" (t)|| ||R' (t)||³ b) When t = 0, the curvature of (C) at the point M(0) is k(0)

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