单项选择题
曲线y=x3(x-4)既单增又向上凹的区间为()
A.(-∞,0) B.(0,+∞) C.(2,+∞) D.(3,+∞)
A.3 B.-5 C.-40 D.-37
A.10arctan2-31n2 B.(5/2)π-3 C.10arctan3-3ln3 D.10arctan(1/3)