(选做题)求下列函数的导数: (1)y=(2x3-x+
(2)y=
(3)y=sin2(2x+
(4)y=
|
(1)y′=4(2x3-x+
)3(6x2-1-1 x
)1 x2
(2)y′= -
=-(
)′1-2x2 1-2x2
=
•1 2
•(-4x)1 1-2x2 1-2x2 2x 1-2x2 (1-2x2)2
(3)y′=2sin(2x+
) cos(2x+π 3
)•2 =2sin(4x+π 3
)2π 3
(4)y′=
(1+x2)-1 2
•2x=1 2 x 1+x2