∫xsin(2+x^2)dx
=1/2∫sin(2+x^2)d(2+x^2)
=-1/2cos(2+x^2)+C
∫(x-1)(x^2-2x+3)^10dx
=1/2∫(x^2-2x+3)^10d(x^2-2x+3)
=1/22*(x^2-2x+3)^11+C