若则等于:(式中c为任意常数) (A)-cos3x+c (B)sin3x+

昕玥2019-12-17  17

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]
转载请注明原文地址:https://ti.zuoweng.com/ti/6BVNKKKQ