Một chuyển động có phương trình: R(t) = (3 sin(3t))i + (3 cos(3t))j + 3tk. Một vector tiếp tuyến với quỹ đạo chuyển động tại thời điểm t = 4 là: Lưu ý: exp(t) nghĩa là e • t^n nghĩa là t” • a*b nghĩa là ab a. R'(4)=(-9cos(12), -9sin(12), 3) O b. R'(4)=(9cos(12), -9sin(12), 3) O c. R'(4)=(9cos(12), 9sin(12), 3) O d. R'(4)=(-9cos(12), 9sin(12), 3)

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