说明理由1.设N=∫(上面是a,下面是-a)x^2sin^3xdx,P=∫(上面是a,下面是-a)[x^3e^(x^2)-1]dx,Q=∫(上面是a,下面是-a)cos^2x^3dx,a≥0,则()A.N≤P≤QB.N≤Q≤PC.Q≤P≤ND.P≤N≤Q

Question

说明理由
1.设N= ∫ (上面是a ,下面是-a) x^2 sin^3 xdx ,P= ∫ (上面是a ,下面是-a) [x^3 e^(x^2)-1] dx ,
Q= ∫ (上面是a ,下面是-a ) cos^2 x^3 dx ,a≥0 ,则 ( )
A.N≤P≤Q B.N≤Q≤P C.Q≤P≤N D.P≤N≤Q

Answer 1

N=0 , P=0-2∫ dx≤0
Q = 2∫ [cos(x^3)]^2dx≥0,
则 P≤N≤Q, 选D