函数y=cos(2x−π3)的导数为_．
问题描述：
函数y=
的导数为______．
cos(2x−
)π 3
答
y′=
=[cos(2x−
)]′π 3 2
cos(2x−
)π 3
=-−2sin(2x−
)π 3 2
cos(2x−
)π 3
，sin(2x−
)π 3
cos(2x−
)π 3
故答案为：y′=-
．sin(2x−
)π 3
cos(2x−
)π 3