A.-cos3x+c B.sin3x+c C.cos3x+c D.(1/3)cos3x+cA

shuhaiku2019-12-17  11

问题

选项 A.-cos3x+cB.sin3x+cC.cos3x+cD.(1/3)cos3x+c

答案A

解析[img]/upload/tiku/233/2658594_1.jpg[/img]
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