∫x^2.sin(x/2)dx=-2∫x^2 dcos(x/2)=-2x^2.cos(x/2) +4∫x.cos(x/2) dx=-2x^2.cos(x/2) +8∫x dsin(x/2)=-2x^2.cos(x/2) +8x.sin(x/2)-8∫sin(x/2) dx=-2x^2.cos(x/2) +8x.sin(x/2) +16cos(x/2) + C
