∫(-π/2->π/2) √[cosx - (cosx)^3]dx=∫(-π/2->π/2) |sinx| √(cosx) dx=-∫(-π/2->0) sinx. √(cosx) dx +∫(0->π/2) sinx. √(cosx) dx=(2/3) [(cosx)^(3/2)]|(-π/2->0) - (2/3) [(cosx)^(3/2)]|(0->π/2)=(2/3) ( 1 - 0) - (2/3) ( 0-1)=4/3
做的是对的,,,加油。