Question Number 92143 by hore last updated on 05/May/20
$${fond}\int\frac{\mathrm{2}{x}}{\mathrm{1}+{x}^{\mathrm{2}} }{dx} \\ $$
Commented by Prithwish Sen 1 last updated on 05/May/20
$$\mathrm{ln}\left(\mathrm{1}+\mathrm{x}^{\mathrm{2}} \right)\:+\mathrm{c}\:\:\:\mathrm{c}=\:\mathrm{const}. \\ $$