计算定积分:
∫π/2-(π/2){[sinx/(1+x2)]+sin2x}dx
∫π/2-(π/2)[sin/(1+x2)]+sin2x)dx=∫π/2-(π/2)+[sinx/(1+x2)]dx+∫π/2-(π/2)sin2xdx =0+2∫π/20sin2xdx =∫π/20(1-cos2x)dx=[x-(1/2)sin2x]π/20=π/2.
计算定积分:
∫π/2-(π/2){[sinx/(1+x2)]+sin2x}dx
∫π/2-(π/2)[sin/(1+x2)]+sin2x)dx=∫π/2-(π/2)+[sinx/(1+x2)]dx+∫π/2-(π/2)sin2xdx =0+2∫π/20sin2xdx =∫π/20(1-cos2x)dx=[x-(1/2)sin2x]π/20=π/2.