若则等于:(式中c为任意常数) (A)-cos3x+c (B)sin3x+

昕玥2019-12-17  19

问题等于:(式中c为任意常数)(A)-cos3x+c (B)sin3x+c(C)cos3x+c(D)

选项

答案A

解析[img]/upload/tiku/190/2460256_1.jpg[/img]
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