Mathematics
Senior High
（6）のcos3xの微分がどうして−3sin3xになるのかがわかりません、、
よろしくお願いします🙇♀️
(6) y=2cos3x·(cos3x)'=D2cos3x·(-3sin 3x)
=-6sin 3xcos 3x =-3sin6x
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