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导数的计算
1. 求下列函数的导数:
(1)y =
21x ; (2
)y = (3)10x y = (4) 2cos y x x =
(5)y = (2x 2 – 5x + 2)e x ; (6)2311;y x x x x ??=++ ???
(7) ()()211y x x =+-
(8)cos .x x
y e = (9) y = (2x +1) 3 (10)2x y a =
(11)2sin(2)y x x =+ (12)(
))cos f x ?=+ (13)()
ln 25y x x =+ (14)12x y x e -=? (15
)y =
2. 设函数()f x 的导函数为()f x ',且()()221f x x x f '=+?,则()0f '等于________.
3.已知函数()'cos sin ,6f x f x x π??
=+ ???则6f π??
???的值为________.