4 求微分方程式 的通解為何?
(A)ex sin2 y+ ycos − siny=c  
(B)ex sin2y + ysin  y− cosy = c
(C)exsin 2  y+ ( y−1)cos  y = c
(D)exsin2 y+ cosy + siny = c

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統計: A(3), B(2), C(0), D(0), E(0) #1021941