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求下列函数导数:
(1)y=2x5-4x2;
(2);
(3)y=x2(2x-1);
(4)y=(x-1)(x-2)(x-3).
求下列函数的导数:
(1)y=x4-3x2-5x+6;
y=xsin x;
y=.
(1)x(x+1)(x+2) (2)tanx (3) (4)y=x-sin·cos