Propietats de la integral definida 1- `\int_a^cf(x)dx=\int_a^bf(x)dx+\int_b^cf(x)dx` 2- `\int_a^bf(x)dx=-\int_b^af(x)dx` 3- `\int_a^af(x)dx=0` 4- `\int_a^b(f(x)+g(x))dx=\int_a^bf(x)dx+\int_a^bg(x)dx` 5- `\int_a^bk·f(x)dx=k\int_a^bf(x)dx`