The value of the integral $$\int\limits_0^2 {|{x^2} - 1|dx} $$ is

The value of $$\int\limits_0^\pi {|\cos x|dx} $$ is

The value of $$\int\limits_{ - 3}^3 {(a{x^5} + b{x^3} + cx + k)dx} $$, where a, b, c, k are constants, depends only on

The value of the integral $$\int\limits_{ - a}^a {{{x{e^{{x^2}}}} \over {1 + {x^2}}}dx} $$ is