cosx的原函数是sinx,x的原函数是0.5x²所以定积分∫(上限π/2,下限-π/2) cosx+x dx= sinx +0.5x² 代入上下限π/2和 -π/2=sin(π/2) +0.5(π/2)² -sin(-π/2) -0.5(π/2)²=1+1=2...