Find the indicated derivative for the given vector-valued function .Find Dtr(t) for r(t) = (t3)i - (csc t)j + 19k.
A. Dtr(t) = (3t2)i + (csc t cot t)j
B. Dtr(t) = (3t2)i + (csc t cot t)k
C. Dtr(t) = (3t2)i + (cot2 t)j
D. Dtr(t) = (3t2)i - (csc t cot t)j
Answer: A
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