Question Number 158517 by cortano last updated on 05/Nov/21
$$\:\:\:\vartheta\:=\int_{\:\mathrm{0}} ^{\:\pi/\mathrm{2}} \frac{{dx}}{\left(\mathrm{1}+\frac{\mathrm{1}}{\mathrm{sin}\:^{\mathrm{2}} {x}}\right)^{\mathrm{2}} }\:? \\ $$
0-pi-2-dx-1-1-sin-2-x-2-