∫xcos(x-1)dx=∫cos(x-1)d(x^2/2)=cos(x-1)*x^2/2-∫xd(cos(x-1)+c=cos(x-1)*x^2/2+∫sin(x-1)d(x^2/2)+c=cos(x-1)*x^2/2+∫sin(x-1)*x^2/2)+c=cos(x-1)*x^2/2+sin(x-1)*x^2/2-∫xcos(x-1)dx+c到此方程两边都有∫xc...