問題詳情

25. Let D = {(x, y)〡 0 ≤ x ≤ 2 , 1 ≤ y ≤ 2} π , then ∫∫ Dx cos(xy)dA =_____ .
(A) −


(B) −1
(C) 0
(D) 


(E) 1



參考答案