y=lnsin(3x-1)
dy/dx=d【lnsin(3x-1)】/d【sin(3x-1)】×d【sin(3x-1)】/d(3x-1)×d(3x-1)/dx
=1/sin(3x-1)×cos(3x-1)×3
=3cot(3x-1)
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