求函数y=cosx*sin(3x+2)的导数

详细的过程哦，亲！

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∵y=cosx*sin(3x+2)
∴y'闷袭昌蚂扒=(cosx)'*sin(3x+2)+cosx*[sin(3x+2)]'禅耐
=-sinx*sin(3x+2)+cosx*3cos(3x+2)
=3cosxcos(3x+2)-sinxsin(3x+2)

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y'=-sinx*sin(3x+2)+cosx*cos(3x+2)*3

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