y=ln cos2⼀x 求dy,忘了复合函数的求导了,求解题步骤和答案,谢谢!

2025-01-19 14:29:05
推荐回答(1个)
回答1:

dy=dln cos2/x
=dcos2/x/cos(2/x)
=-sin(2/x)d(2/x)/cos(2/x)
=2sin(2/x)/x²cos(2/x) dx