This is LaTeX code:
[latex]
= 2\int_0^1 {\arctan t\frac{1} {{1 + t^2 }}dt} - \int_0^1 {\frac{{tdt}} {{1 + t^2 }}} + 3\int_0^1 {\frac{{dt}} {{1 + t^2 }}dt} =
[/latex]