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13. Find the arc length of the curve , 1 ≤ x ≤ 4 .

(A) 36
(B) 30/4
(C) 62/5
(D) 126/6
(E) 254/7

答案：登入後查看
統計： A(0), B(0), C(0), D(0), E(1) #2264877

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