∫abu(x)v′(x)dx=[u(x)v(x)−∫u′(x)v(x)dx]ab\int_a^b u(x)v'(x)dx = [u(x)v(x) - \int u'(x)v(x)dx]_a^b∫abu(x)v′(x)dx=[u(x)v(x)−∫u′(x)v(x)dx]ab
